Thomas Gleixner | 457c899 | 2019-05-19 13:08:55 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * linux/init/main.c |
| 4 | * |
| 5 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 6 | * |
| 7 | * GK 2/5/95 - Changed to support mounting root fs via NFS |
| 8 | * Added initrd & change_root: Werner Almesberger & Hans Lermen, Feb '96 |
| 9 | * Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96 |
Fabian Frederick | dd4d9fe | 2014-08-08 14:23:44 -0700 | [diff] [blame] | 10 | * Simplified starting of init: Michael A. Griffith <grif@acm.org> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | */ |
| 12 | |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 13 | #define DEBUG /* Enable initcall_debug */ |
| 14 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/types.h> |
Paul Gortmaker | 8a293be | 2016-07-23 14:01:45 -0400 | [diff] [blame] | 16 | #include <linux/extable.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/module.h> |
| 18 | #include <linux/proc_fs.h> |
Ingo Molnar | 5c2c5c5 | 2017-02-05 14:24:31 +0100 | [diff] [blame] | 19 | #include <linux/binfmts.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/kernel.h> |
| 21 | #include <linux/syscalls.h> |
Ingo Molnar | 9b5609f | 2008-02-14 09:41:09 +0100 | [diff] [blame] | 22 | #include <linux/stackprotector.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/string.h> |
| 24 | #include <linux/ctype.h> |
| 25 | #include <linux/delay.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/ioport.h> |
| 27 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/initrd.h> |
Mike Rapoport | 57c8a66 | 2018-10-30 15:09:49 -0700 | [diff] [blame] | 29 | #include <linux/memblock.h> |
Len Brown | 4a7a16d | 2009-06-12 20:42:08 -0400 | [diff] [blame] | 30 | #include <linux/acpi.h> |
Masami Hiramatsu | 7684b85 | 2020-01-11 01:03:44 +0900 | [diff] [blame] | 31 | #include <linux/bootconfig.h> |
Nicolas Pitre | 0c68861 | 2017-04-12 18:37:14 -0400 | [diff] [blame] | 32 | #include <linux/console.h> |
Ingo Molnar | 38b8d20 | 2017-02-08 18:51:31 +0100 | [diff] [blame] | 33 | #include <linux/nmi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/percpu.h> |
| 35 | #include <linux/kmod.h> |
Masami Hiramatsu | 82d083a | 2020-09-10 17:55:05 +0900 | [diff] [blame] | 36 | #include <linux/kprobes.h> |
Alexander Potapenko | 3c20650 | 2022-09-15 17:03:51 +0200 | [diff] [blame] | 37 | #include <linux/kmsan.h> |
Nick Piggin | db64fe0 | 2008-10-18 20:27:03 -0700 | [diff] [blame] | 38 | #include <linux/vmalloc.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include <linux/kernel_stat.h> |
Rusty Russell | d7cd561 | 2006-12-07 02:14:08 +0100 | [diff] [blame] | 40 | #include <linux/start_kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #include <linux/security.h> |
Jens Axboe | 3d44223 | 2008-06-26 11:21:34 +0200 | [diff] [blame] | 42 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include <linux/profile.h> |
Alexander Potapenko | 0ce20dd | 2021-02-25 17:18:53 -0800 | [diff] [blame] | 44 | #include <linux/kfence.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #include <linux/rcupdate.h> |
Frederic Weisbecker | 8e9c01c | 2021-04-09 00:38:59 +0200 | [diff] [blame] | 46 | #include <linux/srcu.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #include <linux/moduleparam.h> |
| 48 | #include <linux/kallsyms.h> |
Stephen Boyd | 83cc6fa | 2021-07-07 18:09:13 -0700 | [diff] [blame] | 49 | #include <linux/buildid.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #include <linux/writeback.h> |
| 51 | #include <linux/cpu.h> |
| 52 | #include <linux/cpuset.h> |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 53 | #include <linux/cgroup.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | #include <linux/efi.h> |
Thomas Gleixner | 906568c | 2007-02-16 01:28:01 -0800 | [diff] [blame] | 55 | #include <linux/tick.h> |
Frederic Weisbecker | 7863406 | 2017-10-27 04:42:28 +0200 | [diff] [blame] | 56 | #include <linux/sched/isolation.h> |
Andrew Morton | 6168a70 | 2007-02-17 21:22:39 -0800 | [diff] [blame] | 57 | #include <linux/interrupt.h> |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 58 | #include <linux/taskstats_kern.h> |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 59 | #include <linux/delayacct.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | #include <linux/unistd.h> |
Alexey Dobriyan | 3ea056c | 2018-04-10 16:32:36 -0700 | [diff] [blame] | 61 | #include <linux/utsname.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | #include <linux/rmap.h> |
| 63 | #include <linux/mempolicy.h> |
| 64 | #include <linux/key.h> |
Ingo Molnar | 9a11b49a | 2006-07-03 00:24:33 -0700 | [diff] [blame] | 65 | #include <linux/debug_locks.h> |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 66 | #include <linux/debugobjects.h> |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 67 | #include <linux/lockdep.h> |
Catalin Marinas | 3c7b4e6 | 2009-06-11 13:22:39 +0100 | [diff] [blame] | 68 | #include <linux/kmemleak.h> |
Daniel Jordan | f1b192b | 2020-06-03 15:59:35 -0700 | [diff] [blame] | 69 | #include <linux/padata.h> |
Sukadev Bhattiprolu | 84d7378 | 2006-12-08 02:38:01 -0800 | [diff] [blame] | 70 | #include <linux/pid_namespace.h> |
Greg Kroah-Hartman | 4c002c9 | 2019-12-09 20:33:03 +0100 | [diff] [blame] | 71 | #include <linux/device/driver.h> |
Eric W. Biederman | 73c2799 | 2007-05-09 02:34:32 -0700 | [diff] [blame] | 72 | #include <linux/kthread.h> |
Adrian Bunk | e6fe664 | 2007-11-09 22:39:39 +0100 | [diff] [blame] | 73 | #include <linux/sched.h> |
Ingo Molnar | 1777e46 | 2017-02-05 14:47:12 +0100 | [diff] [blame] | 74 | #include <linux/sched/init.h> |
Adrian Bunk | a1c9eea | 2008-02-06 01:36:44 -0800 | [diff] [blame] | 75 | #include <linux/signal.h> |
Akinobu Mita | 199f0ca | 2008-04-29 01:03:13 -0700 | [diff] [blame] | 76 | #include <linux/idr.h> |
Jason Wessel | 0b4b382 | 2010-05-20 21:04:29 -0500 | [diff] [blame] | 77 | #include <linux/kgdb.h> |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 78 | #include <linux/ftrace.h> |
Arjan van de Ven | 22a9d64 | 2009-01-07 08:45:46 -0800 | [diff] [blame] | 79 | #include <linux/async.h> |
Kay Sievers | 2b2af54 | 2009-04-30 15:23:42 +0200 | [diff] [blame] | 80 | #include <linux/shmem_fs.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 81 | #include <linux/slab.h> |
Peter Zijlstra | 24a24bb | 2010-11-17 23:17:33 +0100 | [diff] [blame] | 82 | #include <linux/perf_event.h> |
Al Viro | a74fb73 | 2012-10-10 21:28:25 -0400 | [diff] [blame] | 83 | #include <linux/ptrace.h> |
Thomas Gleixner | aa8c624 | 2017-12-04 15:07:36 +0100 | [diff] [blame] | 84 | #include <linux/pti.h> |
Tejun Heo | bb813f4 | 2013-01-18 14:05:56 -0800 | [diff] [blame] | 85 | #include <linux/blkdev.h> |
Pavel Tatashin | 5d2a4e9 | 2018-07-19 16:55:41 -0400 | [diff] [blame] | 86 | #include <linux/sched/clock.h> |
Ingo Molnar | 2993002 | 2017-02-08 18:51:36 +0100 | [diff] [blame] | 87 | #include <linux/sched/task.h> |
Ingo Molnar | 68db0cf | 2017-02-08 18:51:37 +0100 | [diff] [blame] | 88 | #include <linux/sched/task_stack.h> |
Frederic Weisbecker | 65f382f | 2013-07-11 19:12:32 +0200 | [diff] [blame] | 89 | #include <linux/context_tracking.h> |
Theodore Ts'o | 47d06e5 | 2013-09-10 10:52:35 -0400 | [diff] [blame] | 90 | #include <linux/random.h> |
Prarit Bhargava | 7b0b73d | 2014-06-04 16:12:17 -0700 | [diff] [blame] | 91 | #include <linux/list.h> |
Dmitry Kasatkin | c9cd2ce | 2014-11-05 17:01:15 +0200 | [diff] [blame] | 92 | #include <linux/integrity.h> |
Al Viro | e149ed2 | 2014-11-01 10:57:28 -0400 | [diff] [blame] | 93 | #include <linux/proc_ns.h> |
Toshi Kani | 0ddab1d | 2015-04-14 15:47:20 -0700 | [diff] [blame] | 94 | #include <linux/io.h> |
AKASHI Takahiro | 39290b3 | 2016-11-14 15:15:05 +0900 | [diff] [blame] | 95 | #include <linux/cache.h> |
Jinbum Park | 2959a5f | 2017-02-27 14:30:22 -0800 | [diff] [blame] | 96 | #include <linux/rodata_test.h> |
Josh Poimboeuf | 3335224 | 2018-02-20 11:37:51 -0600 | [diff] [blame] | 97 | #include <linux/jump_label.h> |
Marco Elver | dfd402a | 2019-11-14 19:02:54 +0100 | [diff] [blame] | 98 | #include <linux/kcsan.h> |
Christoph Hellwig | eb9d7d3 | 2020-07-22 11:14:02 +0200 | [diff] [blame] | 99 | #include <linux/init_syscalls.h> |
Vijayanand Jitta | e1fdc40 | 2021-02-25 17:21:27 -0800 | [diff] [blame] | 100 | #include <linux/stackdepot.h> |
GONG, Ruiqi | 375561b | 2022-06-29 14:04:23 +0800 | [diff] [blame] | 101 | #include <linux/randomize_kstack.h> |
Eric Dumazet | 9c1be193 | 2022-02-05 09:01:25 -0800 | [diff] [blame] | 102 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
| 104 | #include <asm/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | #include <asm/setup.h> |
Andi Kleen | a940199 | 2005-07-28 21:15:30 -0700 | [diff] [blame] | 106 | #include <asm/sections.h> |
Arjan van de Ven | 37b73c8 | 2006-01-06 00:12:01 -0800 | [diff] [blame] | 107 | #include <asm/cacheflush.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | |
Steven Rostedt (VMware) | 4ee7c60 | 2018-03-23 10:18:03 -0400 | [diff] [blame] | 109 | #define CREATE_TRACE_POINTS |
| 110 | #include <trace/events/initcall.h> |
| 111 | |
Brendan Higgins | 8c0d884 | 2020-08-04 13:47:43 -0700 | [diff] [blame] | 112 | #include <kunit/test.h> |
| 113 | |
Sam Ravnborg | aae5f66 | 2007-02-26 16:45:41 +0100 | [diff] [blame] | 114 | static int kernel_init(void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | |
Tejun Heo | 2ce802f | 2011-01-20 12:06:35 +0100 | [diff] [blame] | 116 | /* |
| 117 | * Debug helper: via this flag we know that we are in 'early bootup code' |
| 118 | * where only the boot processor is running with IRQ disabled. This means |
| 119 | * two things - IRQ must not be enabled before the flag is cleared and some |
| 120 | * operations which are not allowed with IRQ disabled are allowed while the |
| 121 | * flag is set. |
| 122 | */ |
| 123 | bool early_boot_irqs_disabled __read_mostly; |
| 124 | |
Paul E. McKenney | a682604 | 2009-02-25 18:03:42 -0800 | [diff] [blame] | 125 | enum system_states system_state __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | EXPORT_SYMBOL(system_state); |
| 127 | |
| 128 | /* |
| 129 | * Boot command-line arguments |
| 130 | */ |
| 131 | #define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT |
| 132 | #define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT |
| 133 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | /* Default late time init is NULL. archs can override this later. */ |
Jan Beulich | d2e3192 | 2009-01-06 14:41:10 -0800 | [diff] [blame] | 135 | void (*__initdata late_time_init)(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 137 | /* Untouched command line saved by arch-specific code. */ |
| 138 | char __initdata boot_command_line[COMMAND_LINE_SIZE]; |
| 139 | /* Untouched saved command line (eg. for /proc) */ |
Alexey Dobriyan | 941baf6 | 2022-09-08 21:21:54 +0300 | [diff] [blame] | 140 | char *saved_command_line __ro_after_init; |
| 141 | unsigned int saved_command_line_len __ro_after_init; |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 142 | /* Command line for parameter parsing */ |
| 143 | static char *static_command_line; |
Masami Hiramatsu | 51887d0 | 2020-01-11 01:04:43 +0900 | [diff] [blame] | 144 | /* Untouched extra command line */ |
| 145 | static char *extra_command_line; |
Masami Hiramatsu | 131991620 | 2020-01-11 01:04:55 +0900 | [diff] [blame] | 146 | /* Extra init arguments */ |
| 147 | static char *extra_init_args; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
Steven Rostedt (VMware) | f61872b | 2020-02-07 19:07:37 -0500 | [diff] [blame] | 149 | #ifdef CONFIG_BOOT_CONFIG |
| 150 | /* Is bootconfig on command line? */ |
Masami Hiramatsu (Google) | caa0708 | 2023-02-28 10:01:42 +0900 | [diff] [blame] | 151 | static bool bootconfig_found; |
Masami Hiramatsu | b66fbbe | 2021-09-05 00:54:16 +0900 | [diff] [blame] | 152 | static size_t initargs_offs; |
Steven Rostedt (VMware) | f61872b | 2020-02-07 19:07:37 -0500 | [diff] [blame] | 153 | #else |
| 154 | # define bootconfig_found false |
Masami Hiramatsu | b66fbbe | 2021-09-05 00:54:16 +0900 | [diff] [blame] | 155 | # define initargs_offs 0 |
Steven Rostedt (VMware) | f61872b | 2020-02-07 19:07:37 -0500 | [diff] [blame] | 156 | #endif |
| 157 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | static char *execute_command; |
Christoph Hellwig | 916db73 | 2020-06-07 09:06:29 +0200 | [diff] [blame] | 159 | static char *ramdisk_execute_command = "/init"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | |
Jan Beulich | 8b3b295 | 2007-07-15 23:41:07 -0700 | [diff] [blame] | 161 | /* |
Hannes Frederic Sowa | c4b2c0c | 2013-10-19 21:48:53 +0200 | [diff] [blame] | 162 | * Used to generate warnings if static_key manipulation functions are used |
| 163 | * before jump_label_init is called. |
| 164 | */ |
Fabian Frederick | dd4d9fe | 2014-08-08 14:23:44 -0700 | [diff] [blame] | 165 | bool static_key_initialized __read_mostly; |
Hannes Frederic Sowa | c4b2c0c | 2013-10-19 21:48:53 +0200 | [diff] [blame] | 166 | EXPORT_SYMBOL_GPL(static_key_initialized); |
| 167 | |
| 168 | /* |
Jan Beulich | 8b3b295 | 2007-07-15 23:41:07 -0700 | [diff] [blame] | 169 | * If set, this is an indication to the drivers that reset the underlying |
| 170 | * device before going ahead with the initialization otherwise driver might |
| 171 | * rely on the BIOS and skip the reset operation. |
| 172 | * |
| 173 | * This is useful if kernel is booting in an unreliable environment. |
Frans Klaver | fc454fd | 2015-02-23 22:05:56 +0100 | [diff] [blame] | 174 | * For ex. kdump situation where previous kernel has crashed, BIOS has been |
Jan Beulich | 8b3b295 | 2007-07-15 23:41:07 -0700 | [diff] [blame] | 175 | * skipped and devices will be in unknown state. |
| 176 | */ |
| 177 | unsigned int reset_devices; |
| 178 | EXPORT_SYMBOL(reset_devices); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | |
Vivek Goyal | 7e96287 | 2006-09-27 01:50:44 -0700 | [diff] [blame] | 180 | static int __init set_reset_devices(char *str) |
| 181 | { |
| 182 | reset_devices = 1; |
| 183 | return 1; |
| 184 | } |
| 185 | |
| 186 | __setup("reset_devices", set_reset_devices); |
| 187 | |
Fabian Frederick | dd4d9fe | 2014-08-08 14:23:44 -0700 | [diff] [blame] | 188 | static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, }; |
| 189 | const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | static const char *panic_later, *panic_param; |
| 191 | |
Yaowei Bai | 31c025b | 2016-01-20 14:59:27 -0800 | [diff] [blame] | 192 | static bool __init obsolete_checksetup(char *line) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | { |
Rusty Russell | 914dcaa | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 194 | const struct obs_kernel_param *p; |
Yaowei Bai | 31c025b | 2016-01-20 14:59:27 -0800 | [diff] [blame] | 195 | bool had_early_param = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | |
| 197 | p = __setup_start; |
| 198 | do { |
| 199 | int n = strlen(p->str); |
Michal Schmidt | b1e4d20 | 2011-10-10 00:03:37 +0200 | [diff] [blame] | 200 | if (parameqn(line, p->str, n)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | if (p->early) { |
Rusty Russell | 33df0d1 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 202 | /* Already done in parse_early_param? |
| 203 | * (Needs exact match on param part). |
| 204 | * Keep iterating, as we can have early |
| 205 | * params and __setups of same names 8( */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | if (line[n] == '\0' || line[n] == '=') |
Yaowei Bai | 31c025b | 2016-01-20 14:59:27 -0800 | [diff] [blame] | 207 | had_early_param = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | } else if (!p->setup_func) { |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 209 | pr_warn("Parameter %s is obsolete, ignored\n", |
| 210 | p->str); |
Yaowei Bai | 31c025b | 2016-01-20 14:59:27 -0800 | [diff] [blame] | 211 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | } else if (p->setup_func(line + n)) |
Yaowei Bai | 31c025b | 2016-01-20 14:59:27 -0800 | [diff] [blame] | 213 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | } |
| 215 | p++; |
| 216 | } while (p < __setup_end); |
Rusty Russell | 33df0d1 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 217 | |
| 218 | return had_early_param; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | } |
| 220 | |
| 221 | /* |
| 222 | * This should be approx 2 Bo*oMips to start (note initial shift), and will |
| 223 | * still work even if initially too large, it will just take slightly longer |
| 224 | */ |
| 225 | unsigned long loops_per_jiffy = (1<<12); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | EXPORT_SYMBOL(loops_per_jiffy); |
| 227 | |
| 228 | static int __init debug_kernel(char *str) |
| 229 | { |
Borislav Petkov | a8fe19e | 2014-06-04 16:11:46 -0700 | [diff] [blame] | 230 | console_loglevel = CONSOLE_LOGLEVEL_DEBUG; |
Yinghai Lu | f6f21c81 | 2008-02-08 04:21:58 -0800 | [diff] [blame] | 231 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | } |
| 233 | |
| 234 | static int __init quiet_kernel(char *str) |
| 235 | { |
Borislav Petkov | a8fe19e | 2014-06-04 16:11:46 -0700 | [diff] [blame] | 236 | console_loglevel = CONSOLE_LOGLEVEL_QUIET; |
Yinghai Lu | f6f21c81 | 2008-02-08 04:21:58 -0800 | [diff] [blame] | 237 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | } |
| 239 | |
Yinghai Lu | f6f21c81 | 2008-02-08 04:21:58 -0800 | [diff] [blame] | 240 | early_param("debug", debug_kernel); |
| 241 | early_param("quiet", quiet_kernel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | |
| 243 | static int __init loglevel(char *str) |
| 244 | { |
Alexander Sverdlin | 808bf29 | 2011-09-21 09:51:40 +0200 | [diff] [blame] | 245 | int newlevel; |
| 246 | |
| 247 | /* |
| 248 | * Only update loglevel value when a correct setting was passed, |
| 249 | * to prevent blind crashes (when loglevel being set to 0) that |
| 250 | * are quite hard to debug |
| 251 | */ |
| 252 | if (get_option(&str, &newlevel)) { |
| 253 | console_loglevel = newlevel; |
| 254 | return 0; |
| 255 | } |
| 256 | |
| 257 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | } |
| 259 | |
Yinghai Lu | f6f21c81 | 2008-02-08 04:21:58 -0800 | [diff] [blame] | 260 | early_param("loglevel", loglevel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | |
Masami Hiramatsu | de462e5 | 2020-04-26 15:53:30 +0900 | [diff] [blame] | 262 | #ifdef CONFIG_BLK_DEV_INITRD |
Masami Hiramatsu | a2a9d67 | 2022-04-06 11:31:19 +0900 | [diff] [blame] | 263 | static void * __init get_boot_config_from_initrd(size_t *_size) |
Masami Hiramatsu | de462e5 | 2020-04-26 15:53:30 +0900 | [diff] [blame] | 264 | { |
| 265 | u32 size, csum; |
| 266 | char *data; |
| 267 | u32 *hdr; |
Masami Hiramatsu | 50b8a74 | 2020-11-13 02:27:31 +0900 | [diff] [blame] | 268 | int i; |
Masami Hiramatsu | de462e5 | 2020-04-26 15:53:30 +0900 | [diff] [blame] | 269 | |
| 270 | if (!initrd_end) |
| 271 | return NULL; |
| 272 | |
| 273 | data = (char *)initrd_end - BOOTCONFIG_MAGIC_LEN; |
Masami Hiramatsu | 50b8a74 | 2020-11-13 02:27:31 +0900 | [diff] [blame] | 274 | /* |
| 275 | * Since Grub may align the size of initrd to 4, we must |
| 276 | * check the preceding 3 bytes as well. |
| 277 | */ |
| 278 | for (i = 0; i < 4; i++) { |
| 279 | if (!memcmp(data, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN)) |
| 280 | goto found; |
| 281 | data--; |
| 282 | } |
| 283 | return NULL; |
Masami Hiramatsu | de462e5 | 2020-04-26 15:53:30 +0900 | [diff] [blame] | 284 | |
Masami Hiramatsu | 50b8a74 | 2020-11-13 02:27:31 +0900 | [diff] [blame] | 285 | found: |
Masami Hiramatsu | de462e5 | 2020-04-26 15:53:30 +0900 | [diff] [blame] | 286 | hdr = (u32 *)(data - 8); |
Masami Hiramatsu | 24aed09 | 2020-11-20 11:29:04 +0900 | [diff] [blame] | 287 | size = le32_to_cpu(hdr[0]); |
| 288 | csum = le32_to_cpu(hdr[1]); |
Masami Hiramatsu | de462e5 | 2020-04-26 15:53:30 +0900 | [diff] [blame] | 289 | |
| 290 | data = ((void *)hdr) - size; |
| 291 | if ((unsigned long)data < initrd_start) { |
| 292 | pr_err("bootconfig size %d is greater than initrd size %ld\n", |
| 293 | size, initrd_end - initrd_start); |
| 294 | return NULL; |
| 295 | } |
| 296 | |
Masami Hiramatsu | 765b855 | 2022-04-06 11:31:09 +0900 | [diff] [blame] | 297 | if (xbc_calc_checksum(data, size) != csum) { |
| 298 | pr_err("bootconfig checksum failed\n"); |
| 299 | return NULL; |
| 300 | } |
| 301 | |
Masami Hiramatsu | de462e5 | 2020-04-26 15:53:30 +0900 | [diff] [blame] | 302 | /* Remove bootconfig from initramfs/initrd */ |
| 303 | initrd_end = (unsigned long)data; |
| 304 | if (_size) |
| 305 | *_size = size; |
Masami Hiramatsu | de462e5 | 2020-04-26 15:53:30 +0900 | [diff] [blame] | 306 | |
| 307 | return data; |
| 308 | } |
| 309 | #else |
Masami Hiramatsu | a2a9d67 | 2022-04-06 11:31:19 +0900 | [diff] [blame] | 310 | static void * __init get_boot_config_from_initrd(size_t *_size) |
Masami Hiramatsu | de462e5 | 2020-04-26 15:53:30 +0900 | [diff] [blame] | 311 | { |
| 312 | return NULL; |
| 313 | } |
| 314 | #endif |
| 315 | |
Masami Hiramatsu | 7684b85 | 2020-01-11 01:03:44 +0900 | [diff] [blame] | 316 | #ifdef CONFIG_BOOT_CONFIG |
Masami Hiramatsu | 51887d0 | 2020-01-11 01:04:43 +0900 | [diff] [blame] | 317 | |
Jason Yan | a27026e | 2020-09-15 15:03:24 +0800 | [diff] [blame] | 318 | static char xbc_namebuf[XBC_KEYLEN_MAX] __initdata; |
Masami Hiramatsu | 51887d0 | 2020-01-11 01:04:43 +0900 | [diff] [blame] | 319 | |
| 320 | #define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0) |
| 321 | |
| 322 | static int __init xbc_snprint_cmdline(char *buf, size_t size, |
| 323 | struct xbc_node *root) |
| 324 | { |
| 325 | struct xbc_node *knode, *vnode; |
| 326 | char *end = buf + size; |
Masami Hiramatsu | 51887d0 | 2020-01-11 01:04:43 +0900 | [diff] [blame] | 327 | const char *val; |
| 328 | int ret; |
| 329 | |
| 330 | xbc_node_for_each_key_value(root, knode, val) { |
| 331 | ret = xbc_node_compose_key_after(root, knode, |
| 332 | xbc_namebuf, XBC_KEYLEN_MAX); |
| 333 | if (ret < 0) |
| 334 | return ret; |
| 335 | |
| 336 | vnode = xbc_node_get_child(knode); |
Masami Hiramatsu | 88b9137 | 2020-02-20 21:19:42 +0900 | [diff] [blame] | 337 | if (!vnode) { |
| 338 | ret = snprintf(buf, rest(buf, end), "%s ", xbc_namebuf); |
Masami Hiramatsu | 51887d0 | 2020-01-11 01:04:43 +0900 | [diff] [blame] | 339 | if (ret < 0) |
| 340 | return ret; |
| 341 | buf += ret; |
Masami Hiramatsu | 88b9137 | 2020-02-20 21:19:42 +0900 | [diff] [blame] | 342 | continue; |
Masami Hiramatsu | 51887d0 | 2020-01-11 01:04:43 +0900 | [diff] [blame] | 343 | } |
Masami Hiramatsu | 88b9137 | 2020-02-20 21:19:42 +0900 | [diff] [blame] | 344 | xbc_array_for_each_value(vnode, val) { |
| 345 | ret = snprintf(buf, rest(buf, end), "%s=\"%s\" ", |
| 346 | xbc_namebuf, val); |
| 347 | if (ret < 0) |
| 348 | return ret; |
| 349 | buf += ret; |
| 350 | } |
Masami Hiramatsu | 51887d0 | 2020-01-11 01:04:43 +0900 | [diff] [blame] | 351 | } |
| 352 | |
| 353 | return buf - (end - size); |
| 354 | } |
| 355 | #undef rest |
| 356 | |
| 357 | /* Make an extra command line under given key word */ |
| 358 | static char * __init xbc_make_cmdline(const char *key) |
| 359 | { |
| 360 | struct xbc_node *root; |
| 361 | char *new_cmdline; |
| 362 | int ret, len = 0; |
| 363 | |
| 364 | root = xbc_find_node(key); |
| 365 | if (!root) |
| 366 | return NULL; |
| 367 | |
| 368 | /* Count required buffer size */ |
| 369 | len = xbc_snprint_cmdline(NULL, 0, root); |
| 370 | if (len <= 0) |
| 371 | return NULL; |
| 372 | |
| 373 | new_cmdline = memblock_alloc(len + 1, SMP_CACHE_BYTES); |
| 374 | if (!new_cmdline) { |
| 375 | pr_err("Failed to allocate memory for extra kernel cmdline.\n"); |
| 376 | return NULL; |
| 377 | } |
| 378 | |
| 379 | ret = xbc_snprint_cmdline(new_cmdline, len + 1, root); |
| 380 | if (ret < 0 || ret > len) { |
| 381 | pr_err("Failed to print extra kernel cmdline.\n"); |
Mike Rapoport | 4421cca0 | 2021-11-05 13:43:22 -0700 | [diff] [blame] | 382 | memblock_free(new_cmdline, len + 1); |
Masami Hiramatsu | 51887d0 | 2020-01-11 01:04:43 +0900 | [diff] [blame] | 383 | return NULL; |
| 384 | } |
| 385 | |
| 386 | return new_cmdline; |
| 387 | } |
| 388 | |
Steven Rostedt (VMware) | f61872b | 2020-02-07 19:07:37 -0500 | [diff] [blame] | 389 | static int __init bootconfig_params(char *param, char *val, |
| 390 | const char *unused, void *arg) |
| 391 | { |
| 392 | if (strcmp(param, "bootconfig") == 0) { |
| 393 | bootconfig_found = true; |
Steven Rostedt (VMware) | f61872b | 2020-02-07 19:07:37 -0500 | [diff] [blame] | 394 | } |
| 395 | return 0; |
| 396 | } |
| 397 | |
Masami Hiramatsu | d0ac5fb | 2021-08-05 11:10:51 +0900 | [diff] [blame] | 398 | static int __init warn_bootconfig(char *str) |
| 399 | { |
| 400 | /* The 'bootconfig' has been handled by bootconfig_params(). */ |
| 401 | return 0; |
| 402 | } |
| 403 | |
Cao jin | 2b7d2fe | 2021-03-11 16:52:13 +0800 | [diff] [blame] | 404 | static void __init setup_boot_config(void) |
Masami Hiramatsu | 7684b85 | 2020-01-11 01:03:44 +0900 | [diff] [blame] | 405 | { |
Steven Rostedt (VMware) | f61872b | 2020-02-07 19:07:37 -0500 | [diff] [blame] | 406 | static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; |
Masami Hiramatsu | a2a9d67 | 2022-04-06 11:31:19 +0900 | [diff] [blame] | 407 | const char *msg, *data; |
| 408 | int pos, ret; |
| 409 | size_t size; |
| 410 | char *err; |
Masami Hiramatsu | 7684b85 | 2020-01-11 01:03:44 +0900 | [diff] [blame] | 411 | |
Masami Hiramatsu | 611d0a9 | 2020-05-11 10:39:24 +0900 | [diff] [blame] | 412 | /* Cut out the bootconfig data even if we have no bootconfig option */ |
Masami Hiramatsu | 765b855 | 2022-04-06 11:31:09 +0900 | [diff] [blame] | 413 | data = get_boot_config_from_initrd(&size); |
Masami Hiramatsu | a2a9d67 | 2022-04-06 11:31:19 +0900 | [diff] [blame] | 414 | /* If there is no bootconfig in initrd, try embedded one. */ |
| 415 | if (!data) |
| 416 | data = xbc_get_embedded_bootconfig(&size); |
Masami Hiramatsu | de462e5 | 2020-04-26 15:53:30 +0900 | [diff] [blame] | 417 | |
Wolfram Sang | a1d3a6d | 2022-08-18 23:01:59 +0200 | [diff] [blame] | 418 | strscpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
Masami Hiramatsu | 477d084 | 2020-08-04 11:52:13 +0900 | [diff] [blame] | 419 | err = parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL, |
| 420 | bootconfig_params); |
Steven Rostedt (VMware) | f61872b | 2020-02-07 19:07:37 -0500 | [diff] [blame] | 421 | |
Masami Hiramatsu (Google) | caa0708 | 2023-02-28 10:01:42 +0900 | [diff] [blame] | 422 | if (IS_ERR(err) || !(bootconfig_found || IS_ENABLED(CONFIG_BOOT_CONFIG_FORCE))) |
Masami Hiramatsu | 7684b85 | 2020-01-11 01:03:44 +0900 | [diff] [blame] | 423 | return; |
| 424 | |
Masami Hiramatsu | b66fbbe | 2021-09-05 00:54:16 +0900 | [diff] [blame] | 425 | /* parse_args() stops at the next param of '--' and returns an address */ |
Masami Hiramatsu | 477d084 | 2020-08-04 11:52:13 +0900 | [diff] [blame] | 426 | if (err) |
Masami Hiramatsu | b66fbbe | 2021-09-05 00:54:16 +0900 | [diff] [blame] | 427 | initargs_offs = err - tmp_cmdline; |
Masami Hiramatsu | 477d084 | 2020-08-04 11:52:13 +0900 | [diff] [blame] | 428 | |
Masami Hiramatsu | 611d0a9 | 2020-05-11 10:39:24 +0900 | [diff] [blame] | 429 | if (!data) { |
Masami Hiramatsu (Google) | caa0708 | 2023-02-28 10:01:42 +0900 | [diff] [blame] | 430 | /* If user intended to use bootconfig, show an error level message */ |
| 431 | if (bootconfig_found) |
| 432 | pr_err("'bootconfig' found on command line, but no bootconfig found\n"); |
| 433 | else |
| 434 | pr_info("No bootconfig data provided, so skipping bootconfig"); |
Masami Hiramatsu | 611d0a9 | 2020-05-11 10:39:24 +0900 | [diff] [blame] | 435 | return; |
| 436 | } |
| 437 | |
Steven Rostedt (VMware) | 7495e09 | 2020-02-04 07:33:53 -0500 | [diff] [blame] | 438 | if (size >= XBC_DATA_MAX) { |
Masami Hiramatsu | a2a9d67 | 2022-04-06 11:31:19 +0900 | [diff] [blame] | 439 | pr_err("bootconfig size %ld greater than max size %d\n", |
| 440 | (long)size, XBC_DATA_MAX); |
Masami Hiramatsu | 7684b85 | 2020-01-11 01:03:44 +0900 | [diff] [blame] | 441 | return; |
Steven Rostedt (VMware) | 7495e09 | 2020-02-04 07:33:53 -0500 | [diff] [blame] | 442 | } |
Masami Hiramatsu | 7684b85 | 2020-01-11 01:03:44 +0900 | [diff] [blame] | 443 | |
Masami Hiramatsu | bdac5c2 | 2021-09-16 15:23:20 +0900 | [diff] [blame] | 444 | ret = xbc_init(data, size, &msg, &pos); |
Masami Hiramatsu | 89b74ca | 2020-03-03 20:24:50 +0900 | [diff] [blame] | 445 | if (ret < 0) { |
| 446 | if (pos < 0) |
| 447 | pr_err("Failed to init bootconfig: %s.\n", msg); |
| 448 | else |
| 449 | pr_err("Failed to parse bootconfig: %s at %d.\n", |
| 450 | msg, pos); |
| 451 | } else { |
Masami Hiramatsu | e306220 | 2021-09-16 15:23:29 +0900 | [diff] [blame] | 452 | xbc_get_info(&ret, NULL); |
Masami Hiramatsu | a2a9d67 | 2022-04-06 11:31:19 +0900 | [diff] [blame] | 453 | pr_info("Load bootconfig: %ld bytes %d nodes\n", (long)size, ret); |
Masami Hiramatsu | 51887d0 | 2020-01-11 01:04:43 +0900 | [diff] [blame] | 454 | /* keys starting with "kernel." are passed via cmdline */ |
| 455 | extra_command_line = xbc_make_cmdline("kernel"); |
Masami Hiramatsu | 131991620 | 2020-01-11 01:04:55 +0900 | [diff] [blame] | 456 | /* Also, "init." keys are init arguments */ |
| 457 | extra_init_args = xbc_make_cmdline("init"); |
Masami Hiramatsu | 51887d0 | 2020-01-11 01:04:43 +0900 | [diff] [blame] | 458 | } |
Steven Rostedt (VMware) | 7495e09 | 2020-02-04 07:33:53 -0500 | [diff] [blame] | 459 | return; |
Masami Hiramatsu | 7684b85 | 2020-01-11 01:03:44 +0900 | [diff] [blame] | 460 | } |
Masami Hiramatsu | de462e5 | 2020-04-26 15:53:30 +0900 | [diff] [blame] | 461 | |
Masami Hiramatsu | 40caa12 | 2021-09-05 00:54:09 +0900 | [diff] [blame] | 462 | static void __init exit_boot_config(void) |
| 463 | { |
Masami Hiramatsu | 115d4d0 | 2021-09-17 19:02:39 +0900 | [diff] [blame] | 464 | xbc_exit(); |
Masami Hiramatsu | 40caa12 | 2021-09-05 00:54:09 +0900 | [diff] [blame] | 465 | } |
| 466 | |
| 467 | #else /* !CONFIG_BOOT_CONFIG */ |
Masami Hiramatsu | de462e5 | 2020-04-26 15:53:30 +0900 | [diff] [blame] | 468 | |
Cao jin | 2b7d2fe | 2021-03-11 16:52:13 +0800 | [diff] [blame] | 469 | static void __init setup_boot_config(void) |
Masami Hiramatsu | de462e5 | 2020-04-26 15:53:30 +0900 | [diff] [blame] | 470 | { |
| 471 | /* Remove bootconfig data from initrd */ |
Masami Hiramatsu | 765b855 | 2022-04-06 11:31:09 +0900 | [diff] [blame] | 472 | get_boot_config_from_initrd(NULL); |
Masami Hiramatsu | de462e5 | 2020-04-26 15:53:30 +0900 | [diff] [blame] | 473 | } |
Masami Hiramatsu | d8a953d | 2020-02-20 21:18:33 +0900 | [diff] [blame] | 474 | |
| 475 | static int __init warn_bootconfig(char *str) |
| 476 | { |
Shaokun Zhang | 36c6aa2 | 2020-05-09 16:33:55 +0800 | [diff] [blame] | 477 | pr_warn("WARNING: 'bootconfig' found on the kernel command line but CONFIG_BOOT_CONFIG is not set.\n"); |
Masami Hiramatsu | d8a953d | 2020-02-20 21:18:33 +0900 | [diff] [blame] | 478 | return 0; |
| 479 | } |
Masami Hiramatsu | 40caa12 | 2021-09-05 00:54:09 +0900 | [diff] [blame] | 480 | |
| 481 | #define exit_boot_config() do {} while (0) |
| 482 | |
| 483 | #endif /* CONFIG_BOOT_CONFIG */ |
| 484 | |
Masami Hiramatsu | d0ac5fb | 2021-08-05 11:10:51 +0900 | [diff] [blame] | 485 | early_param("bootconfig", warn_bootconfig); |
Masami Hiramatsu | 7684b85 | 2020-01-11 01:03:44 +0900 | [diff] [blame] | 486 | |
Chris Metcalf | a99cd11 | 2012-04-06 12:53:50 -0400 | [diff] [blame] | 487 | /* Change NUL term back to "=", to make "param" the whole string. */ |
Arvind Sankar | 7e2762e | 2020-01-30 22:17:16 -0800 | [diff] [blame] | 488 | static void __init repair_env_string(char *param, char *val) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | if (val) { |
| 491 | /* param=val or param="val"? */ |
| 492 | if (val == param+strlen(param)+1) |
| 493 | val[-1] = '='; |
| 494 | else if (val == param+strlen(param)+2) { |
| 495 | val[-2] = '='; |
| 496 | memmove(val-1, val, strlen(val)+1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | } else |
| 498 | BUG(); |
| 499 | } |
Chris Metcalf | a99cd11 | 2012-04-06 12:53:50 -0400 | [diff] [blame] | 500 | } |
| 501 | |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 502 | /* Anything after -- gets handed straight to init. */ |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 503 | static int __init set_init_arg(char *param, char *val, |
| 504 | const char *unused, void *arg) |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 505 | { |
| 506 | unsigned int i; |
| 507 | |
| 508 | if (panic_later) |
| 509 | return 0; |
| 510 | |
Arvind Sankar | 7e2762e | 2020-01-30 22:17:16 -0800 | [diff] [blame] | 511 | repair_env_string(param, val); |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 512 | |
| 513 | for (i = 0; argv_init[i]; i++) { |
| 514 | if (i == MAX_INIT_ARGS) { |
| 515 | panic_later = "init"; |
| 516 | panic_param = param; |
| 517 | return 0; |
| 518 | } |
| 519 | } |
| 520 | argv_init[i] = param; |
| 521 | return 0; |
| 522 | } |
| 523 | |
Chris Metcalf | a99cd11 | 2012-04-06 12:53:50 -0400 | [diff] [blame] | 524 | /* |
| 525 | * Unknown boot options get handed to init, unless they look like |
| 526 | * unused parameters (modprobe will find them in /proc/cmdline). |
| 527 | */ |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 528 | static int __init unknown_bootoption(char *param, char *val, |
| 529 | const char *unused, void *arg) |
Chris Metcalf | a99cd11 | 2012-04-06 12:53:50 -0400 | [diff] [blame] | 530 | { |
Arvind Sankar | 283900e | 2020-01-30 22:17:19 -0800 | [diff] [blame] | 531 | size_t len = strlen(param); |
| 532 | |
Arvind Sankar | 7e2762e | 2020-01-30 22:17:16 -0800 | [diff] [blame] | 533 | repair_env_string(param, val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | |
| 535 | /* Handle obsolete-style parameters */ |
| 536 | if (obsolete_checksetup(param)) |
| 537 | return 0; |
| 538 | |
Rusty Russell | f066a4f | 2009-12-01 14:56:44 +1030 | [diff] [blame] | 539 | /* Unused module parameter. */ |
Arvind Sankar | 283900e | 2020-01-30 22:17:19 -0800 | [diff] [blame] | 540 | if (strnchr(param, len, '.')) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | |
| 543 | if (panic_later) |
| 544 | return 0; |
| 545 | |
| 546 | if (val) { |
| 547 | /* Environment option */ |
| 548 | unsigned int i; |
| 549 | for (i = 0; envp_init[i]; i++) { |
| 550 | if (i == MAX_INIT_ENVS) { |
Tetsuo Handa | 499a458 | 2014-01-23 15:54:56 -0800 | [diff] [blame] | 551 | panic_later = "env"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | panic_param = param; |
| 553 | } |
Arvind Sankar | 283900e | 2020-01-30 22:17:19 -0800 | [diff] [blame] | 554 | if (!strncmp(param, envp_init[i], len+1)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | break; |
| 556 | } |
| 557 | envp_init[i] = param; |
| 558 | } else { |
| 559 | /* Command line option */ |
| 560 | unsigned int i; |
| 561 | for (i = 0; argv_init[i]; i++) { |
| 562 | if (i == MAX_INIT_ARGS) { |
Tetsuo Handa | 499a458 | 2014-01-23 15:54:56 -0800 | [diff] [blame] | 563 | panic_later = "init"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | panic_param = param; |
| 565 | } |
| 566 | } |
| 567 | argv_init[i] = param; |
| 568 | } |
| 569 | return 0; |
| 570 | } |
| 571 | |
| 572 | static int __init init_setup(char *str) |
| 573 | { |
| 574 | unsigned int i; |
| 575 | |
| 576 | execute_command = str; |
| 577 | /* |
| 578 | * In case LILO is going to boot us with default command line, |
| 579 | * it prepends "auto" before the whole cmdline which makes |
| 580 | * the shell think it should execute a script with such name. |
| 581 | * So we ignore all arguments entered _before_ init=... [MJ] |
| 582 | */ |
| 583 | for (i = 1; i < MAX_INIT_ARGS; i++) |
| 584 | argv_init[i] = NULL; |
| 585 | return 1; |
| 586 | } |
| 587 | __setup("init=", init_setup); |
| 588 | |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 589 | static int __init rdinit_setup(char *str) |
| 590 | { |
| 591 | unsigned int i; |
| 592 | |
| 593 | ramdisk_execute_command = str; |
| 594 | /* See "auto" comment in init_setup */ |
| 595 | for (i = 1; i < MAX_INIT_ARGS; i++) |
| 596 | argv_init[i] = NULL; |
| 597 | return 1; |
| 598 | } |
| 599 | __setup("rdinit=", rdinit_setup); |
| 600 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | #ifndef CONFIG_SMP |
Amerigo Wang | 34db18a0 | 2011-03-22 16:34:06 -0700 | [diff] [blame] | 602 | static const unsigned int setup_max_cpus = NR_CPUS; |
Mike Travis | e0982e9 | 2008-03-26 14:23:48 -0700 | [diff] [blame] | 603 | static inline void setup_nr_cpu_ids(void) { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | static inline void smp_prepare_cpus(unsigned int maxcpus) { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | #endif |
| 606 | |
| 607 | /* |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 608 | * We need to store the untouched command line for future reference. |
| 609 | * We also need to store the touched command line since the parameter |
| 610 | * parsing is performed in place, and we should allow a component to |
| 611 | * store reference of name/value for future reference. |
| 612 | */ |
| 613 | static void __init setup_command_line(char *command_line) |
| 614 | { |
Masami Hiramatsu | 131991620 | 2020-01-11 01:04:55 +0900 | [diff] [blame] | 615 | size_t len, xlen = 0, ilen = 0; |
Mike Rapoport | f5c7310 | 2019-03-11 23:30:20 -0700 | [diff] [blame] | 616 | |
Masami Hiramatsu | 51887d0 | 2020-01-11 01:04:43 +0900 | [diff] [blame] | 617 | if (extra_command_line) |
| 618 | xlen = strlen(extra_command_line); |
Masami Hiramatsu | 131991620 | 2020-01-11 01:04:55 +0900 | [diff] [blame] | 619 | if (extra_init_args) |
| 620 | ilen = strlen(extra_init_args) + 4; /* for " -- " */ |
Masami Hiramatsu | 51887d0 | 2020-01-11 01:04:43 +0900 | [diff] [blame] | 621 | |
| 622 | len = xlen + strlen(boot_command_line) + 1; |
Mike Rapoport | f5c7310 | 2019-03-11 23:30:20 -0700 | [diff] [blame] | 623 | |
Masami Hiramatsu | 131991620 | 2020-01-11 01:04:55 +0900 | [diff] [blame] | 624 | saved_command_line = memblock_alloc(len + ilen, SMP_CACHE_BYTES); |
Mike Rapoport | f5c7310 | 2019-03-11 23:30:20 -0700 | [diff] [blame] | 625 | if (!saved_command_line) |
Masami Hiramatsu | 131991620 | 2020-01-11 01:04:55 +0900 | [diff] [blame] | 626 | panic("%s: Failed to allocate %zu bytes\n", __func__, len + ilen); |
Mike Rapoport | f5c7310 | 2019-03-11 23:30:20 -0700 | [diff] [blame] | 627 | |
| 628 | static_command_line = memblock_alloc(len, SMP_CACHE_BYTES); |
| 629 | if (!static_command_line) |
| 630 | panic("%s: Failed to allocate %zu bytes\n", __func__, len); |
| 631 | |
Masami Hiramatsu | 51887d0 | 2020-01-11 01:04:43 +0900 | [diff] [blame] | 632 | if (xlen) { |
| 633 | /* |
| 634 | * We have to put extra_command_line before boot command |
| 635 | * lines because there could be dashes (separator of init |
| 636 | * command line) in the command lines. |
| 637 | */ |
| 638 | strcpy(saved_command_line, extra_command_line); |
| 639 | strcpy(static_command_line, extra_command_line); |
| 640 | } |
| 641 | strcpy(saved_command_line + xlen, boot_command_line); |
| 642 | strcpy(static_command_line + xlen, command_line); |
Masami Hiramatsu | 131991620 | 2020-01-11 01:04:55 +0900 | [diff] [blame] | 643 | |
| 644 | if (ilen) { |
| 645 | /* |
| 646 | * Append supplemental init boot args to saved_command_line |
| 647 | * so that user can check what command line options passed |
| 648 | * to init. |
Masami Hiramatsu | b66fbbe | 2021-09-05 00:54:16 +0900 | [diff] [blame] | 649 | * The order should always be |
| 650 | * " -- "[bootconfig init-param][cmdline init-param] |
Masami Hiramatsu | 131991620 | 2020-01-11 01:04:55 +0900 | [diff] [blame] | 651 | */ |
Masami Hiramatsu | b66fbbe | 2021-09-05 00:54:16 +0900 | [diff] [blame] | 652 | if (initargs_offs) { |
| 653 | len = xlen + initargs_offs; |
| 654 | strcpy(saved_command_line + len, extra_init_args); |
| 655 | len += ilen - 4; /* strlen(extra_init_args) */ |
| 656 | strcpy(saved_command_line + len, |
| 657 | boot_command_line + initargs_offs - 1); |
Steven Rostedt (VMware) | f61872b | 2020-02-07 19:07:37 -0500 | [diff] [blame] | 658 | } else { |
Masami Hiramatsu | b66fbbe | 2021-09-05 00:54:16 +0900 | [diff] [blame] | 659 | len = strlen(saved_command_line); |
Masami Hiramatsu | 131991620 | 2020-01-11 01:04:55 +0900 | [diff] [blame] | 660 | strcpy(saved_command_line + len, " -- "); |
| 661 | len += 4; |
Masami Hiramatsu | b66fbbe | 2021-09-05 00:54:16 +0900 | [diff] [blame] | 662 | strcpy(saved_command_line + len, extra_init_args); |
Steven Rostedt (VMware) | f61872b | 2020-02-07 19:07:37 -0500 | [diff] [blame] | 663 | } |
Masami Hiramatsu | 131991620 | 2020-01-11 01:04:55 +0900 | [diff] [blame] | 664 | } |
Alexey Dobriyan | 941baf6 | 2022-09-08 21:21:54 +0300 | [diff] [blame] | 665 | |
| 666 | saved_command_line_len = strlen(saved_command_line); |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 667 | } |
| 668 | |
| 669 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | * We need to finalize in a non-__init function or else race conditions |
| 671 | * between the root thread and the init thread may cause start_kernel to |
| 672 | * be reaped by free_initmem before the root thread has proceeded to |
| 673 | * cpu_idle. |
| 674 | * |
| 675 | * gcc-3.4 accidentally inlines this function, so use noinline. |
| 676 | */ |
| 677 | |
Peter Zijlstra | b433c3d | 2010-06-28 16:51:01 +0200 | [diff] [blame] | 678 | static __initdata DECLARE_COMPLETION(kthreadd_done); |
| 679 | |
Josh Poimboeuf | 9ea7e6b | 2023-04-12 16:49:31 -0700 | [diff] [blame] | 680 | noinline void __ref __noreturn rest_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | { |
Thomas Gleixner | 8fb1215 | 2017-05-16 20:42:32 +0200 | [diff] [blame] | 682 | struct task_struct *tsk; |
Eric W. Biederman | 73c2799 | 2007-05-09 02:34:32 -0700 | [diff] [blame] | 683 | int pid; |
| 684 | |
Paul E. McKenney | 7db905e | 2009-09-02 14:01:24 -0700 | [diff] [blame] | 685 | rcu_scheduler_starting(); |
Peter Zijlstra | b433c3d | 2010-06-28 16:51:01 +0200 | [diff] [blame] | 686 | /* |
Peter Zijlstra | 9715856 | 2010-06-30 10:37:11 +0200 | [diff] [blame] | 687 | * We need to spawn init first so that it obtains pid 1, however |
Peter Zijlstra | b433c3d | 2010-06-28 16:51:01 +0200 | [diff] [blame] | 688 | * the init task will end up wanting to create kthreads, which, if |
| 689 | * we schedule it before we create kthreadd, will OOPS. |
| 690 | */ |
Eric W. Biederman | 343f4c4 | 2022-04-11 11:40:14 -0500 | [diff] [blame] | 691 | pid = user_mode_thread(kernel_init, NULL, CLONE_FS); |
Thomas Gleixner | 8fb1215 | 2017-05-16 20:42:32 +0200 | [diff] [blame] | 692 | /* |
| 693 | * Pin init on the boot CPU. Task migration is not properly working |
| 694 | * until sched_init_smp() has been run. It will set the allowed |
| 695 | * CPUs for init to the non isolated CPUs. |
| 696 | */ |
| 697 | rcu_read_lock(); |
| 698 | tsk = find_task_by_pid_ns(pid, &init_pid_ns); |
Peter Zijlstra | 15faafc | 2021-05-31 12:21:13 +0200 | [diff] [blame] | 699 | tsk->flags |= PF_NO_SETAFFINITY; |
Thomas Gleixner | 8fb1215 | 2017-05-16 20:42:32 +0200 | [diff] [blame] | 700 | set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id())); |
| 701 | rcu_read_unlock(); |
| 702 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | numa_default_policy(); |
Mike Christie | cf587db | 2023-03-10 16:03:23 -0600 | [diff] [blame] | 704 | pid = kernel_thread(kthreadd, NULL, NULL, CLONE_FS | CLONE_FILES); |
Paul E. McKenney | d11c563 | 2010-02-22 17:04:50 -0800 | [diff] [blame] | 705 | rcu_read_lock(); |
Pavel Emelyanov | 5cd2045 | 2008-04-30 00:54:24 -0700 | [diff] [blame] | 706 | kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns); |
Paul E. McKenney | d11c563 | 2010-02-22 17:04:50 -0800 | [diff] [blame] | 707 | rcu_read_unlock(); |
Thomas Gleixner | 1c3c5ea | 2017-05-16 20:42:48 +0200 | [diff] [blame] | 708 | |
| 709 | /* |
| 710 | * Enable might_sleep() and smp_processor_id() checks. |
Thomas Gleixner | c1a280b | 2019-07-26 23:19:37 +0200 | [diff] [blame] | 711 | * They cannot be enabled earlier because with CONFIG_PREEMPTION=y |
Thomas Gleixner | 1c3c5ea | 2017-05-16 20:42:48 +0200 | [diff] [blame] | 712 | * kernel_thread() would trigger might_sleep() splats. With |
| 713 | * CONFIG_PREEMPT_VOLUNTARY=y the init task might have scheduled |
| 714 | * already, but it's stuck on the kthreadd_done completion. |
| 715 | */ |
| 716 | system_state = SYSTEM_SCHEDULING; |
| 717 | |
Peter Zijlstra | b433c3d | 2010-06-28 16:51:01 +0200 | [diff] [blame] | 718 | complete(&kthreadd_done); |
Ingo Molnar | f340c0d | 2005-06-28 16:40:42 +0200 | [diff] [blame] | 719 | |
| 720 | /* |
| 721 | * The boot idle thread must execute schedule() |
Ingo Molnar | 1df2105 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 722 | * at least once to get things moving: |
Ingo Molnar | f340c0d | 2005-06-28 16:40:42 +0200 | [diff] [blame] | 723 | */ |
Thomas Gleixner | bd2f553 | 2011-03-21 12:33:18 +0100 | [diff] [blame] | 724 | schedule_preempt_disabled(); |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 725 | /* Call into cpu_idle with preempt disabled */ |
Thomas Gleixner | a1a04ec | 2013-03-21 22:49:34 +0100 | [diff] [blame] | 726 | cpu_startup_entry(CPUHP_ONLINE); |
Ingo Molnar | 1df2105 | 2007-07-09 18:51:58 +0200 | [diff] [blame] | 727 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | |
| 729 | /* Check for early params. */ |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 730 | static int __init do_early_param(char *param, char *val, |
| 731 | const char *unused, void *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | { |
Rusty Russell | 914dcaa | 2010-08-11 23:04:18 -0600 | [diff] [blame] | 733 | const struct obs_kernel_param *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | |
| 735 | for (p = __setup_start; p < __setup_end; p++) { |
Michal Schmidt | b1e4d20 | 2011-10-10 00:03:37 +0200 | [diff] [blame] | 736 | if ((p->early && parameq(param, p->str)) || |
Yinghai Lu | 18a8bd9 | 2007-07-15 23:37:59 -0700 | [diff] [blame] | 737 | (strcmp(param, "console") == 0 && |
| 738 | strcmp(p->str, "earlycon") == 0) |
| 739 | ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | if (p->setup_func(val) != 0) |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 741 | pr_warn("Malformed early option '%s'\n", param); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | } |
| 743 | } |
| 744 | /* We accept everything at this stage. */ |
| 745 | return 0; |
| 746 | } |
| 747 | |
Magnus Damm | 1397709 | 2009-03-30 14:37:25 -0700 | [diff] [blame] | 748 | void __init parse_early_options(char *cmdline) |
| 749 | { |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 750 | parse_args("early options", cmdline, NULL, 0, 0, 0, NULL, |
| 751 | do_early_param); |
Magnus Damm | 1397709 | 2009-03-30 14:37:25 -0700 | [diff] [blame] | 752 | } |
| 753 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | /* Arch code calls this early on, or if not, just before other parsing. */ |
| 755 | void __init parse_early_param(void) |
| 756 | { |
Fabian Frederick | dd4d9fe | 2014-08-08 14:23:44 -0700 | [diff] [blame] | 757 | static int done __initdata; |
| 758 | static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | |
| 760 | if (done) |
| 761 | return; |
| 762 | |
| 763 | /* All fall through to do_early_param. */ |
Wolfram Sang | a1d3a6d | 2022-08-18 23:01:59 +0200 | [diff] [blame] | 764 | strscpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
Magnus Damm | 1397709 | 2009-03-30 14:37:25 -0700 | [diff] [blame] | 765 | parse_early_options(tmp_cmdline); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | done = 1; |
| 767 | } |
| 768 | |
Thomas Gleixner | e7ff3a4 | 2016-12-09 19:29:10 +0100 | [diff] [blame] | 769 | void __init __weak arch_post_acpi_subsys_init(void) { } |
| 770 | |
Benjamin Herrenschmidt | 839ad62 | 2008-04-18 16:56:18 +1000 | [diff] [blame] | 771 | void __init __weak smp_setup_processor_id(void) |
Andrew Morton | 033ab7f | 2006-06-30 01:55:50 -0700 | [diff] [blame] | 772 | { |
| 773 | } |
| 774 | |
David Howells | eded09c | 2012-11-02 13:20:42 +0000 | [diff] [blame] | 775 | # if THREAD_SIZE >= PAGE_SIZE |
Linus Torvalds | b235bee | 2016-06-24 15:09:37 -0700 | [diff] [blame] | 776 | void __init __weak thread_stack_cache_init(void) |
Benjamin Herrenschmidt | 8c9843e | 2008-04-18 16:56:15 +1000 | [diff] [blame] | 777 | { |
| 778 | } |
David Howells | eded09c | 2012-11-02 13:20:42 +0000 | [diff] [blame] | 779 | #endif |
Benjamin Herrenschmidt | 8c9843e | 2008-04-18 16:56:15 +1000 | [diff] [blame] | 780 | |
Nadav Amit | 4fc1970 | 2019-04-26 16:22:46 -0700 | [diff] [blame] | 781 | void __init __weak poking_init(void) { } |
| 782 | |
Mike Rapoport | 782de70 | 2019-09-23 15:35:31 -0700 | [diff] [blame] | 783 | void __init __weak pgtable_cache_init(void) { } |
Nadav Amit | caa84136 | 2019-05-04 18:11:24 -0700 | [diff] [blame] | 784 | |
Kefeng Wang | 8b09788 | 2021-09-07 20:16:06 -0700 | [diff] [blame] | 785 | void __init __weak trap_init(void) { } |
| 786 | |
Steven Rostedt (VMware) | 4e37958 | 2018-03-26 13:31:07 -0400 | [diff] [blame] | 787 | bool initcall_debug; |
| 788 | core_param(initcall_debug, initcall_debug, bool, 0644); |
Steven Rostedt (VMware) | b0dc52f | 2018-04-06 09:24:25 -0400 | [diff] [blame] | 789 | |
| 790 | #ifdef TRACEPOINTS_ENABLED |
Steven Rostedt (VMware) | 4e37958 | 2018-03-26 13:31:07 -0400 | [diff] [blame] | 791 | static void __init initcall_debug_enable(void); |
Steven Rostedt (VMware) | b0dc52f | 2018-04-06 09:24:25 -0400 | [diff] [blame] | 792 | #else |
| 793 | static inline void initcall_debug_enable(void) |
| 794 | { |
| 795 | } |
| 796 | #endif |
Steven Rostedt (VMware) | 4e37958 | 2018-03-26 13:31:07 -0400 | [diff] [blame] | 797 | |
Marco Elver | 8cb37a5 | 2022-01-31 10:05:20 +0100 | [diff] [blame] | 798 | #ifdef CONFIG_RANDOMIZE_KSTACK_OFFSET |
Kees Cook | 39218ff | 2021-04-01 16:23:44 -0700 | [diff] [blame] | 799 | DEFINE_STATIC_KEY_MAYBE_RO(CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT, |
| 800 | randomize_kstack_offset); |
| 801 | DEFINE_PER_CPU(u32, kstack_offset); |
| 802 | |
| 803 | static int __init early_randomize_kstack_offset(char *buf) |
| 804 | { |
| 805 | int ret; |
| 806 | bool bool_result; |
| 807 | |
| 808 | ret = kstrtobool(buf, &bool_result); |
| 809 | if (ret) |
| 810 | return ret; |
| 811 | |
| 812 | if (bool_result) |
| 813 | static_branch_enable(&randomize_kstack_offset); |
| 814 | else |
| 815 | static_branch_disable(&randomize_kstack_offset); |
| 816 | return 0; |
| 817 | } |
| 818 | early_param("randomize_kstack_offset", early_randomize_kstack_offset); |
| 819 | #endif |
| 820 | |
Josh Poimboeuf | 9ea7e6b | 2023-04-12 16:49:31 -0700 | [diff] [blame] | 821 | void __init __weak __noreturn arch_call_rest_init(void) |
Martin Schwidefsky | 53c99bd6 | 2018-08-31 10:42:24 +0200 | [diff] [blame] | 822 | { |
| 823 | rest_init(); |
| 824 | } |
| 825 | |
Andrew Halaney | 86d1919 | 2021-06-30 18:56:28 -0700 | [diff] [blame] | 826 | static void __init print_unknown_bootoptions(void) |
| 827 | { |
| 828 | char *unknown_options; |
| 829 | char *end; |
| 830 | const char *const *p; |
| 831 | size_t len; |
| 832 | |
| 833 | if (panic_later || (!argv_init[1] && !envp_init[2])) |
| 834 | return; |
| 835 | |
| 836 | /* |
| 837 | * Determine how many options we have to print out, plus a space |
| 838 | * before each |
| 839 | */ |
| 840 | len = 1; /* null terminator */ |
| 841 | for (p = &argv_init[1]; *p; p++) { |
| 842 | len++; |
| 843 | len += strlen(*p); |
| 844 | } |
| 845 | for (p = &envp_init[2]; *p; p++) { |
| 846 | len++; |
| 847 | len += strlen(*p); |
| 848 | } |
| 849 | |
| 850 | unknown_options = memblock_alloc(len, SMP_CACHE_BYTES); |
| 851 | if (!unknown_options) { |
| 852 | pr_err("%s: Failed to allocate %zu bytes\n", |
| 853 | __func__, len); |
| 854 | return; |
| 855 | } |
| 856 | end = unknown_options; |
| 857 | |
| 858 | for (p = &argv_init[1]; *p; p++) |
| 859 | end += sprintf(end, " %s", *p); |
| 860 | for (p = &envp_init[2]; *p; p++) |
| 861 | end += sprintf(end, " %s", *p); |
| 862 | |
Andrew Halaney | 8bc2b3d | 2021-11-08 18:34:27 -0800 | [diff] [blame] | 863 | /* Start at unknown_options[1] to skip the initial space */ |
| 864 | pr_notice("Unknown kernel command line parameters \"%s\", will be passed to user space.\n", |
| 865 | &unknown_options[1]); |
Mike Rapoport | 4421cca0 | 2021-11-05 13:43:22 -0700 | [diff] [blame] | 866 | memblock_free(unknown_options, len); |
Andrew Halaney | 86d1919 | 2021-06-30 18:56:28 -0700 | [diff] [blame] | 867 | } |
| 868 | |
ndesaulniers@google.com | 514ca14 | 2023-04-17 15:00:05 -0700 | [diff] [blame] | 869 | asmlinkage __visible __init __no_sanitize_address __noreturn __no_stack_protector |
| 870 | void start_kernel(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | { |
Fabian Frederick | dd4d9fe | 2014-08-08 14:23:44 -0700 | [diff] [blame] | 872 | char *command_line; |
| 873 | char *after_dashes; |
Andrew Morton | 033ab7f | 2006-06-30 01:55:50 -0700 | [diff] [blame] | 874 | |
Aaron Tomlin | d4311ff | 2014-09-12 14:16:17 +0100 | [diff] [blame] | 875 | set_task_stack_end_magic(&init_task); |
Ming Lei | 73839c5 | 2011-11-17 13:34:31 +0800 | [diff] [blame] | 876 | smp_setup_processor_id(); |
Thomas Gleixner | 3ac7fe5 | 2008-04-30 00:55:01 -0700 | [diff] [blame] | 877 | debug_objects_early_init(); |
Stephen Boyd | 83cc6fa | 2021-07-07 18:09:13 -0700 | [diff] [blame] | 878 | init_vmlinux_build_id(); |
Ingo Molnar | 4205942 | 2008-02-14 09:44:08 +0100 | [diff] [blame] | 879 | |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 880 | cgroup_init_early(); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 881 | |
| 882 | local_irq_disable(); |
Tejun Heo | 2ce802f | 2011-01-20 12:06:35 +0100 | [diff] [blame] | 883 | early_boot_irqs_disabled = true; |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 884 | |
Viresh Kumar | 1b3b3b4 | 2017-03-23 17:00:05 +0530 | [diff] [blame] | 885 | /* |
| 886 | * Interrupts are still disabled. Do necessary setups, then |
| 887 | * enable them. |
| 888 | */ |
Stas Sergeev | 44fd229 | 2006-03-23 02:59:44 -0800 | [diff] [blame] | 889 | boot_cpu_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | page_address_init(); |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 891 | pr_notice("%s", linux_banner); |
Matthew Garrett | e6b1db9 | 2019-08-19 17:17:37 -0700 | [diff] [blame] | 892 | early_security_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | setup_arch(&command_line); |
Cao jin | 2b7d2fe | 2021-03-11 16:52:13 +0800 | [diff] [blame] | 894 | setup_boot_config(); |
Alon Bar-Lev | 30d7e0d | 2007-02-12 00:53:52 -0800 | [diff] [blame] | 895 | setup_command_line(command_line); |
Mike Travis | e0982e9 | 2008-03-26 14:23:48 -0700 | [diff] [blame] | 896 | setup_nr_cpu_ids(); |
Tejun Heo | d6647bd | 2009-07-21 17:11:50 +0900 | [diff] [blame] | 897 | setup_per_cpu_areas(); |
Stas Sergeev | 44fd229 | 2006-03-23 02:59:44 -0800 | [diff] [blame] | 898 | smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ |
Linus Torvalds | b5b1404 | 2018-08-12 12:19:42 -0700 | [diff] [blame] | 899 | boot_cpu_hotplug_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | |
Masami Hiramatsu | 51887d0 | 2020-01-11 01:04:43 +0900 | [diff] [blame] | 901 | pr_notice("Kernel command line: %s\n", saved_command_line); |
Dan Williams | 6041186 | 2019-04-18 17:50:44 -0700 | [diff] [blame] | 902 | /* parameters may set static keys */ |
| 903 | jump_label_init(); |
Pekka Enberg | 83b519e | 2009-06-10 19:40:04 +0300 | [diff] [blame] | 904 | parse_early_param(); |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 905 | after_dashes = parse_args("Booting kernel", |
| 906 | static_command_line, __start___param, |
| 907 | __stop___param - __start___param, |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 908 | -1, -1, NULL, &unknown_bootoption); |
Andrew Halaney | 86d1919 | 2021-06-30 18:56:28 -0700 | [diff] [blame] | 909 | print_unknown_bootoptions(); |
Daniel Thompson | 3438cf5 | 2014-11-11 16:29:46 +1030 | [diff] [blame] | 910 | if (!IS_ERR_OR_NULL(after_dashes)) |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 911 | parse_args("Setting init args", after_dashes, NULL, 0, -1, -1, |
Luis R. Rodriguez | ecc8617 | 2015-03-30 16:20:03 -0700 | [diff] [blame] | 912 | NULL, set_init_arg); |
Masami Hiramatsu | 131991620 | 2020-01-11 01:04:55 +0900 | [diff] [blame] | 913 | if (extra_init_args) |
| 914 | parse_args("Setting extra init args", extra_init_args, |
| 915 | NULL, 0, -1, -1, NULL, set_init_arg); |
Jeremy Fitzhardinge | 97ce2c8 | 2011-10-12 16:17:54 -0700 | [diff] [blame] | 916 | |
Jason A. Donenfeld | f623849 | 2022-09-26 17:43:14 +0200 | [diff] [blame] | 917 | /* Architectural and non-timekeeping rng init, before allocator init */ |
| 918 | random_init_early(command_line); |
| 919 | |
Pekka Enberg | 83b519e | 2009-06-10 19:40:04 +0300 | [diff] [blame] | 920 | /* |
| 921 | * These use large bootmem allocations and must precede |
Mike Rapoport (IBM) | b7ec1bf | 2023-03-21 19:05:06 +0200 | [diff] [blame] | 922 | * initalization of page allocator |
Pekka Enberg | 83b519e | 2009-06-10 19:40:04 +0300 | [diff] [blame] | 923 | */ |
Mike Travis | 162a7e7 | 2011-05-24 17:13:20 -0700 | [diff] [blame] | 924 | setup_log_buf(0); |
Pekka Enberg | 83b519e | 2009-06-10 19:40:04 +0300 | [diff] [blame] | 925 | vfs_caches_init_early(); |
| 926 | sort_main_extable(); |
| 927 | trap_init(); |
Mike Rapoport (IBM) | b7ec1bf | 2023-03-21 19:05:06 +0200 | [diff] [blame] | 928 | mm_core_init(); |
Peter Zijlstra | 5b93a83 | 2022-10-25 21:38:25 +0200 | [diff] [blame] | 929 | poking_init(); |
Steven Rostedt (VMware) | f631718 | 2017-03-03 13:43:34 -0500 | [diff] [blame] | 930 | ftrace_init(); |
| 931 | |
Steven Rostedt (VMware) | e725c73 | 2017-03-03 13:37:33 -0500 | [diff] [blame] | 932 | /* trace_printk can be enabled here */ |
| 933 | early_trace_init(); |
| 934 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | /* |
| 936 | * Set up the scheduler prior starting any interrupts (such as the |
| 937 | * timer interrupt). Full topology setup happens at smp_init() |
| 938 | * time - but meanwhile we still have a functioning scheduler. |
| 939 | */ |
| 940 | sched_init(); |
Valentin Schneider | f1a0a37 | 2021-05-12 10:46:36 +0100 | [diff] [blame] | 941 | |
Fabian Frederick | dd4d9fe | 2014-08-08 14:23:44 -0700 | [diff] [blame] | 942 | if (WARN(!irqs_disabled(), |
| 943 | "Interrupts were enabled *very* early, fixing it\n")) |
Ard van Breemen | c4a6830 | 2007-01-05 16:36:19 -0800 | [diff] [blame] | 944 | local_irq_disable(); |
Matthew Wilcox | 0a835c4 | 2016-12-20 10:27:56 -0500 | [diff] [blame] | 945 | radix_tree_init(); |
Liam R. Howlett | 54a611b | 2022-09-06 19:48:39 +0000 | [diff] [blame] | 946 | maple_tree_init(); |
Tejun Heo | 3347fa0 | 2016-09-16 15:49:32 -0400 | [diff] [blame] | 947 | |
| 948 | /* |
Tal Shorer | 7d229c6 | 2017-11-03 17:27:49 +0200 | [diff] [blame] | 949 | * Set up housekeeping before setting up workqueues to allow the unbound |
| 950 | * workqueue to take non-housekeeping into account. |
| 951 | */ |
| 952 | housekeeping_init(); |
| 953 | |
| 954 | /* |
Tejun Heo | 3347fa0 | 2016-09-16 15:49:32 -0400 | [diff] [blame] | 955 | * Allow workqueue creation and work item queueing/cancelling |
| 956 | * early. Work item execution depends on kthreads and starts after |
| 957 | * workqueue_init(). |
| 958 | */ |
| 959 | workqueue_init_early(); |
| 960 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | rcu_init(); |
Steven Rostedt (Red Hat) | 5f893b2 | 2014-12-12 20:05:10 -0500 | [diff] [blame] | 962 | |
Steven Rostedt (VMware) | e725c73 | 2017-03-03 13:37:33 -0500 | [diff] [blame] | 963 | /* Trace events are available after this */ |
Steven Rostedt (Red Hat) | 5f893b2 | 2014-12-12 20:05:10 -0500 | [diff] [blame] | 964 | trace_init(); |
| 965 | |
Steven Rostedt (VMware) | 4e37958 | 2018-03-26 13:31:07 -0400 | [diff] [blame] | 966 | if (initcall_debug) |
| 967 | initcall_debug_enable(); |
| 968 | |
Frederic Weisbecker | 65f382f | 2013-07-11 19:12:32 +0200 | [diff] [blame] | 969 | context_tracking_init(); |
Yinghai Lu | 0b8f1ef | 2008-12-05 18:58:31 -0800 | [diff] [blame] | 970 | /* init some links before init_ISA_irqs() */ |
| 971 | early_irq_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | init_IRQ(); |
Thomas Gleixner | ad2b135 | 2013-03-05 15:14:05 +0100 | [diff] [blame] | 973 | tick_init(); |
Linus Torvalds | d6dd50e | 2014-10-13 15:44:12 +0200 | [diff] [blame] | 974 | rcu_init_nohz(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | init_timers(); |
Frederic Weisbecker | 8e9c01c | 2021-04-09 00:38:59 +0200 | [diff] [blame] | 976 | srcu_init(); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 977 | hrtimers_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | softirq_init(); |
john stultz | ad59617 | 2006-06-26 00:25:06 -0700 | [diff] [blame] | 979 | timekeeping_init(); |
Jason A. Donenfeld | fe222a6 | 2022-05-05 02:20:22 +0200 | [diff] [blame] | 980 | time_init(); |
Kees Cook | d555352 | 2019-04-19 23:27:05 -0400 | [diff] [blame] | 981 | |
Jason A. Donenfeld | f623849 | 2022-09-26 17:43:14 +0200 | [diff] [blame] | 982 | /* This must be after timekeeping is initialized */ |
| 983 | random_init(); |
| 984 | |
| 985 | /* These make use of the fully initialized rng */ |
| 986 | kfence_init(); |
Kees Cook | d555352 | 2019-04-19 23:27:05 -0400 | [diff] [blame] | 987 | boot_init_stack_canary(); |
| 988 | |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 989 | perf_event_init(); |
Heiko Carstens | 93e0281 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 990 | profile_init(); |
Takao Indoh | d8ad7d1 | 2011-03-29 12:35:04 -0400 | [diff] [blame] | 991 | call_function_init(); |
Steven Rostedt | f91eb62 | 2013-04-29 16:18:18 -0700 | [diff] [blame] | 992 | WARN(!irqs_disabled(), "Interrupts were enabled early\n"); |
Joel Fernandes (Google) | c3bc8fd | 2018-07-30 15:24:23 -0700 | [diff] [blame] | 993 | |
Tejun Heo | 2ce802f | 2011-01-20 12:06:35 +0100 | [diff] [blame] | 994 | early_boot_irqs_disabled = false; |
Heiko Carstens | 93e0281 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 995 | local_irq_enable(); |
Benjamin Herrenschmidt | dcce284 | 2009-06-18 13:24:12 +1000 | [diff] [blame] | 996 | |
Pekka Enberg | 7e85ee0 | 2009-06-12 14:03:06 +0300 | [diff] [blame] | 997 | kmem_cache_init_late(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | |
| 999 | /* |
| 1000 | * HACK ALERT! This is early. We're enabling the console before |
| 1001 | * we've done PCI setups etc, and console_init() must be aware of |
| 1002 | * this. But we do want output early, in case something goes wrong. |
| 1003 | */ |
| 1004 | console_init(); |
| 1005 | if (panic_later) |
Tetsuo Handa | 499a458 | 2014-01-23 15:54:56 -0800 | [diff] [blame] | 1006 | panic("Too many boot %s vars at `%s'", panic_later, |
| 1007 | panic_param); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 1008 | |
Joel Fernandes (Google) | c3bc8fd | 2018-07-30 15:24:23 -0700 | [diff] [blame] | 1009 | lockdep_init(); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 1010 | |
Ingo Molnar | 9a11b49a | 2006-07-03 00:24:33 -0700 | [diff] [blame] | 1011 | /* |
| 1012 | * Need to run this when irqs are enabled, because it wants |
| 1013 | * to self-test [hard/soft]-irqs on/off lock inversion bugs |
| 1014 | * too: |
| 1015 | */ |
| 1016 | locking_selftest(); |
| 1017 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | #ifdef CONFIG_BLK_DEV_INITRD |
| 1019 | if (initrd_start && !initrd_below_start_ok && |
Geert Uytterhoeven | bd673c7 | 2008-07-29 22:33:36 -0700 | [diff] [blame] | 1020 | page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) { |
Andrew Morton | ea676e8 | 2013-04-29 16:18:20 -0700 | [diff] [blame] | 1021 | pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n", |
Geert Uytterhoeven | bd673c7 | 2008-07-29 22:33:36 -0700 | [diff] [blame] | 1022 | page_to_pfn(virt_to_page((void *)initrd_start)), |
| 1023 | min_low_pfn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | initrd_start = 0; |
| 1025 | } |
| 1026 | #endif |
Christoph Lameter | e7c8d5c | 2005-06-21 17:14:47 -0700 | [diff] [blame] | 1027 | setup_per_cpu_pageset(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | numa_policy_init(); |
Dou Liyang | 9c71206 | 2017-09-13 17:17:54 +0800 | [diff] [blame] | 1029 | acpi_early_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | if (late_time_init) |
| 1031 | late_time_init(); |
Pavel Tatashin | 857baa8 | 2018-07-19 16:55:42 -0400 | [diff] [blame] | 1032 | sched_clock_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | calibrate_delay(); |
Michael Kelley | e45e761 | 2023-03-08 18:40:06 -0800 | [diff] [blame] | 1034 | |
Thomas Gleixner | 9df9d2f | 2023-06-14 01:39:39 +0200 | [diff] [blame] | 1035 | arch_cpu_finalize_init(); |
| 1036 | |
Gargi Sharma | 95846ec | 2017-11-17 15:30:30 -0800 | [diff] [blame] | 1037 | pid_idr_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | anon_vma_init(); |
Linus Torvalds | 11520e5 | 2012-12-15 15:15:24 -0800 | [diff] [blame] | 1039 | #ifdef CONFIG_X86 |
Matt Fleming | 83e6818 | 2012-11-14 09:42:35 +0000 | [diff] [blame] | 1040 | if (efi_enabled(EFI_RUNTIME_SERVICES)) |
Linus Torvalds | 11520e5 | 2012-12-15 15:15:24 -0800 | [diff] [blame] | 1041 | efi_enter_virtual_mode(); |
| 1042 | #endif |
Linus Torvalds | b235bee | 2016-06-24 15:09:37 -0700 | [diff] [blame] | 1043 | thread_stack_cache_init(); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1044 | cred_init(); |
Heinrich Schuchardt | ff691f6 | 2015-04-16 12:47:44 -0700 | [diff] [blame] | 1045 | fork_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | proc_caches_init(); |
Alexey Dobriyan | 3ea056c | 2018-04-10 16:32:36 -0700 | [diff] [blame] | 1047 | uts_ns_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | key_init(); |
| 1049 | security_init(); |
Jason Wessel | 0b4b382 | 2010-05-20 21:04:29 -0500 | [diff] [blame] | 1050 | dbg_late_init(); |
Eric Dumazet | 9c1be193 | 2022-02-05 09:01:25 -0800 | [diff] [blame] | 1051 | net_ns_init(); |
Mel Gorman | 4248b0d | 2015-08-06 15:46:20 -0700 | [diff] [blame] | 1052 | vfs_caches_init(); |
Nicholas Piggin | 6290602 | 2016-12-25 13:00:30 +1000 | [diff] [blame] | 1053 | pagecache_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | signals_init(); |
Alexey Dobriyan | 096523203 | 2018-04-10 16:34:45 -0700 | [diff] [blame] | 1055 | seq_file_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | proc_root_init(); |
Al Viro | e149ed2 | 2014-11-01 10:57:28 -0400 | [diff] [blame] | 1057 | nsfs_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | cpuset_init(); |
Zefan Li | 695df21 | 2015-03-04 17:09:33 +0800 | [diff] [blame] | 1059 | cgroup_init(); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 1060 | taskstats_init_early(); |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 1061 | delayacct_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | |
Rafael J. Wysocki | b064a8f | 2015-06-10 01:33:36 +0200 | [diff] [blame] | 1063 | acpi_subsystem_init(); |
Thomas Gleixner | e7ff3a4 | 2016-12-09 19:29:10 +0100 | [diff] [blame] | 1064 | arch_post_acpi_subsys_init(); |
Marco Elver | dfd402a | 2019-11-14 19:02:54 +0100 | [diff] [blame] | 1065 | kcsan_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | |
| 1067 | /* Do the rest non-__init'ed, we're now alive */ |
Martin Schwidefsky | 53c99bd6 | 2018-08-31 10:42:24 +0200 | [diff] [blame] | 1068 | arch_call_rest_init(); |
Borislav Petkov | a9a3ed1 | 2020-04-22 18:11:30 +0200 | [diff] [blame] | 1069 | |
ndesaulniers@google.com | dc1d055 | 2023-04-17 15:00:06 -0700 | [diff] [blame] | 1070 | /* |
| 1071 | * Avoid stack canaries in callers of boot_init_stack_canary for gcc-10 |
| 1072 | * and older. |
| 1073 | */ |
| 1074 | #if !__has_attribute(__no_stack_protector__) |
Borislav Petkov | a9a3ed1 | 2020-04-22 18:11:30 +0200 | [diff] [blame] | 1075 | prevent_tail_call_optimization(); |
ndesaulniers@google.com | dc1d055 | 2023-04-17 15:00:06 -0700 | [diff] [blame] | 1076 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | } |
| 1078 | |
Peter Oberparleiter | b99b87f7 | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 1079 | /* Call all constructor functions linked into the kernel. */ |
| 1080 | static void __init do_ctors(void) |
| 1081 | { |
Johannes Berg | 55b6f763 | 2021-02-04 18:32:28 -0800 | [diff] [blame] | 1082 | /* |
| 1083 | * For UML, the constructors have already been called by the |
| 1084 | * normal setup code as it's just a normal ELF binary, so we |
| 1085 | * cannot do it again - but we do need CONFIG_CONSTRUCTORS |
| 1086 | * even on UML for modules. |
| 1087 | */ |
| 1088 | #if defined(CONFIG_CONSTRUCTORS) && !defined(CONFIG_UML) |
H Hartley Sweeten | 196a15b | 2009-12-14 18:00:18 -0800 | [diff] [blame] | 1089 | ctor_fn_t *fn = (ctor_fn_t *) __ctors_start; |
Peter Oberparleiter | b99b87f7 | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 1090 | |
H Hartley Sweeten | 196a15b | 2009-12-14 18:00:18 -0800 | [diff] [blame] | 1091 | for (; fn < (ctor_fn_t *) __ctors_end; fn++) |
| 1092 | (*fn)(); |
Peter Oberparleiter | b99b87f7 | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 1093 | #endif |
| 1094 | } |
| 1095 | |
Prarit Bhargava | 7b0b73d | 2014-06-04 16:12:17 -0700 | [diff] [blame] | 1096 | #ifdef CONFIG_KALLSYMS |
| 1097 | struct blacklist_entry { |
| 1098 | struct list_head next; |
| 1099 | char *buf; |
| 1100 | }; |
| 1101 | |
| 1102 | static __initdata_or_module LIST_HEAD(blacklisted_initcalls); |
| 1103 | |
| 1104 | static int __init initcall_blacklist(char *str) |
| 1105 | { |
| 1106 | char *str_entry; |
| 1107 | struct blacklist_entry *entry; |
| 1108 | |
| 1109 | /* str argument is a comma-separated list of functions */ |
| 1110 | do { |
| 1111 | str_entry = strsep(&str, ","); |
| 1112 | if (str_entry) { |
| 1113 | pr_debug("blacklisting initcall %s\n", str_entry); |
Mike Rapoport | 7e1c4e2 | 2018-10-30 15:09:57 -0700 | [diff] [blame] | 1114 | entry = memblock_alloc(sizeof(*entry), |
| 1115 | SMP_CACHE_BYTES); |
Mike Rapoport | f5c7310 | 2019-03-11 23:30:20 -0700 | [diff] [blame] | 1116 | if (!entry) |
| 1117 | panic("%s: Failed to allocate %zu bytes\n", |
| 1118 | __func__, sizeof(*entry)); |
Mike Rapoport | 7e1c4e2 | 2018-10-30 15:09:57 -0700 | [diff] [blame] | 1119 | entry->buf = memblock_alloc(strlen(str_entry) + 1, |
| 1120 | SMP_CACHE_BYTES); |
Mike Rapoport | f5c7310 | 2019-03-11 23:30:20 -0700 | [diff] [blame] | 1121 | if (!entry->buf) |
| 1122 | panic("%s: Failed to allocate %zu bytes\n", |
| 1123 | __func__, strlen(str_entry) + 1); |
Prarit Bhargava | 7b0b73d | 2014-06-04 16:12:17 -0700 | [diff] [blame] | 1124 | strcpy(entry->buf, str_entry); |
| 1125 | list_add(&entry->next, &blacklisted_initcalls); |
| 1126 | } |
| 1127 | } while (str_entry); |
| 1128 | |
Randy Dunlap | f9a40b0 | 2022-03-23 16:06:14 -0700 | [diff] [blame] | 1129 | return 1; |
Prarit Bhargava | 7b0b73d | 2014-06-04 16:12:17 -0700 | [diff] [blame] | 1130 | } |
| 1131 | |
| 1132 | static bool __init_or_module initcall_blacklisted(initcall_t fn) |
| 1133 | { |
Prarit Bhargava | 7b0b73d | 2014-06-04 16:12:17 -0700 | [diff] [blame] | 1134 | struct blacklist_entry *entry; |
Rasmus Villemoes | c8cdd2b | 2016-05-20 17:04:27 -0700 | [diff] [blame] | 1135 | char fn_name[KSYM_SYMBOL_LEN]; |
Rasmus Villemoes | 0fd5ed8 | 2016-06-24 14:50:30 -0700 | [diff] [blame] | 1136 | unsigned long addr; |
Prarit Bhargava | 7b0b73d | 2014-06-04 16:12:17 -0700 | [diff] [blame] | 1137 | |
Rasmus Villemoes | c8cdd2b | 2016-05-20 17:04:27 -0700 | [diff] [blame] | 1138 | if (list_empty(&blacklisted_initcalls)) |
Prarit Bhargava | 7b0b73d | 2014-06-04 16:12:17 -0700 | [diff] [blame] | 1139 | return false; |
| 1140 | |
Rasmus Villemoes | 0fd5ed8 | 2016-06-24 14:50:30 -0700 | [diff] [blame] | 1141 | addr = (unsigned long) dereference_function_descriptor(fn); |
| 1142 | sprint_symbol_no_offset(fn_name, addr); |
Rasmus Villemoes | c8cdd2b | 2016-05-20 17:04:27 -0700 | [diff] [blame] | 1143 | |
Prarit Bhargava | 841c06d | 2016-08-02 14:07:15 -0700 | [diff] [blame] | 1144 | /* |
| 1145 | * fn will be "function_name [module_name]" where [module_name] is not |
| 1146 | * displayed for built-in init functions. Strip off the [module_name]. |
| 1147 | */ |
| 1148 | strreplace(fn_name, ' ', '\0'); |
| 1149 | |
Geliang Tang | e6fd1fb | 2016-03-15 14:52:46 -0700 | [diff] [blame] | 1150 | list_for_each_entry(entry, &blacklisted_initcalls, next) { |
Prarit Bhargava | 7b0b73d | 2014-06-04 16:12:17 -0700 | [diff] [blame] | 1151 | if (!strcmp(fn_name, entry->buf)) { |
| 1152 | pr_debug("initcall %s blacklisted\n", fn_name); |
Prarit Bhargava | 7b0b73d | 2014-06-04 16:12:17 -0700 | [diff] [blame] | 1153 | return true; |
| 1154 | } |
| 1155 | } |
| 1156 | |
Prarit Bhargava | 7b0b73d | 2014-06-04 16:12:17 -0700 | [diff] [blame] | 1157 | return false; |
| 1158 | } |
| 1159 | #else |
| 1160 | static int __init initcall_blacklist(char *str) |
| 1161 | { |
| 1162 | pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n"); |
| 1163 | return 0; |
| 1164 | } |
| 1165 | |
| 1166 | static bool __init_or_module initcall_blacklisted(initcall_t fn) |
| 1167 | { |
| 1168 | return false; |
| 1169 | } |
| 1170 | #endif |
| 1171 | __setup("initcall_blacklist=", initcall_blacklist); |
| 1172 | |
Steven Rostedt (VMware) | 4e37958 | 2018-03-26 13:31:07 -0400 | [diff] [blame] | 1173 | static __init_or_module void |
| 1174 | trace_initcall_start_cb(void *data, initcall_t fn) |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 1175 | { |
Zhou jie | 374d6cd | 2022-09-28 09:45:39 +0800 | [diff] [blame] | 1176 | ktime_t *calltime = data; |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 1177 | |
Geert Uytterhoeven | 58e2cf5 | 2021-09-01 09:09:28 +0200 | [diff] [blame] | 1178 | printk(KERN_DEBUG "calling %pS @ %i\n", fn, task_pid_nr(current)); |
Steven Rostedt (VMware) | 4e37958 | 2018-03-26 13:31:07 -0400 | [diff] [blame] | 1179 | *calltime = ktime_get(); |
| 1180 | } |
| 1181 | |
| 1182 | static __init_or_module void |
| 1183 | trace_initcall_finish_cb(void *data, initcall_t fn, int ret) |
| 1184 | { |
Zhou jie | 374d6cd | 2022-09-28 09:45:39 +0800 | [diff] [blame] | 1185 | ktime_t rettime, *calltime = data; |
Steven Rostedt (VMware) | 4e37958 | 2018-03-26 13:31:07 -0400 | [diff] [blame] | 1186 | |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 1187 | rettime = ktime_get(); |
Geert Uytterhoeven | 58e2cf5 | 2021-09-01 09:09:28 +0200 | [diff] [blame] | 1188 | printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n", |
Mark-PK Tsai | 105e8c2 | 2022-03-23 16:06:08 -0700 | [diff] [blame] | 1189 | fn, ret, (unsigned long long)ktime_us_delta(rettime, *calltime)); |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 1190 | } |
| 1191 | |
Steven Rostedt (VMware) | 4e37958 | 2018-03-26 13:31:07 -0400 | [diff] [blame] | 1192 | static ktime_t initcall_calltime; |
| 1193 | |
Steven Rostedt (VMware) | b0dc52f | 2018-04-06 09:24:25 -0400 | [diff] [blame] | 1194 | #ifdef TRACEPOINTS_ENABLED |
Steven Rostedt (VMware) | 4e37958 | 2018-03-26 13:31:07 -0400 | [diff] [blame] | 1195 | static void __init initcall_debug_enable(void) |
| 1196 | { |
| 1197 | int ret; |
| 1198 | |
| 1199 | ret = register_trace_initcall_start(trace_initcall_start_cb, |
| 1200 | &initcall_calltime); |
| 1201 | ret |= register_trace_initcall_finish(trace_initcall_finish_cb, |
| 1202 | &initcall_calltime); |
| 1203 | WARN(ret, "Failed to register initcall tracepoints\n"); |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 1204 | } |
Steven Rostedt (VMware) | b0dc52f | 2018-04-06 09:24:25 -0400 | [diff] [blame] | 1205 | # define do_trace_initcall_start trace_initcall_start |
| 1206 | # define do_trace_initcall_finish trace_initcall_finish |
| 1207 | #else |
| 1208 | static inline void do_trace_initcall_start(initcall_t fn) |
| 1209 | { |
| 1210 | if (!initcall_debug) |
| 1211 | return; |
| 1212 | trace_initcall_start_cb(&initcall_calltime, fn); |
| 1213 | } |
| 1214 | static inline void do_trace_initcall_finish(initcall_t fn, int ret) |
| 1215 | { |
| 1216 | if (!initcall_debug) |
| 1217 | return; |
| 1218 | trace_initcall_finish_cb(&initcall_calltime, fn, ret); |
| 1219 | } |
| 1220 | #endif /* !TRACEPOINTS_ENABLED */ |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 1221 | |
Kevin Winchester | e446127 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 1222 | int __init_or_module do_one_initcall(initcall_t fn) |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 1223 | { |
| 1224 | int count = preempt_count(); |
Steven Rostedt | ff1c8fa | 2013-07-03 15:05:37 -0700 | [diff] [blame] | 1225 | char msgbuf[64]; |
Steven Rostedt (VMware) | 4e37958 | 2018-03-26 13:31:07 -0400 | [diff] [blame] | 1226 | int ret; |
Kevin Winchester | 22c5c03 | 2010-08-09 17:20:32 -0700 | [diff] [blame] | 1227 | |
Prarit Bhargava | 7b0b73d | 2014-06-04 16:12:17 -0700 | [diff] [blame] | 1228 | if (initcall_blacklisted(fn)) |
| 1229 | return -EPERM; |
| 1230 | |
Steven Rostedt (VMware) | b0dc52f | 2018-04-06 09:24:25 -0400 | [diff] [blame] | 1231 | do_trace_initcall_start(fn); |
Steven Rostedt (VMware) | 4e37958 | 2018-03-26 13:31:07 -0400 | [diff] [blame] | 1232 | ret = fn(); |
Steven Rostedt (VMware) | b0dc52f | 2018-04-06 09:24:25 -0400 | [diff] [blame] | 1233 | do_trace_initcall_finish(fn, ret); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 1234 | |
| 1235 | msgbuf[0] = 0; |
| 1236 | |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 1237 | if (preempt_count() != count) { |
Steven Rostedt | bf5d770 | 2013-05-01 13:35:51 -0400 | [diff] [blame] | 1238 | sprintf(msgbuf, "preemption imbalance "); |
Peter Zijlstra | 4a2b4b2 | 2013-08-14 14:55:24 +0200 | [diff] [blame] | 1239 | preempt_count_set(count); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 1240 | } |
| 1241 | if (irqs_disabled()) { |
Cyrill Gorcunov | a76bfd0 | 2008-05-15 13:52:41 -0700 | [diff] [blame] | 1242 | strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf)); |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 1243 | local_irq_enable(); |
| 1244 | } |
Sakari Ailus | d75f773 | 2019-03-25 21:32:28 +0200 | [diff] [blame] | 1245 | WARN(msgbuf[0], "initcall %pS returned with %s\n", fn, msgbuf); |
Arjan van de Ven | 59f9415 | 2008-07-30 12:49:02 -0700 | [diff] [blame] | 1246 | |
Emese Revfy | 38addce | 2016-06-20 20:41:19 +0200 | [diff] [blame] | 1247 | add_latent_entropy(); |
Américo Wang | 30dbb20e | 2010-05-26 18:57:53 +0800 | [diff] [blame] | 1248 | return ret; |
Linus Torvalds | e0df154 | 2008-05-15 18:14:01 -0700 | [diff] [blame] | 1249 | } |
| 1250 | |
| 1251 | |
Ard Biesheuvel | 1b1eeca | 2018-08-21 21:56:13 -0700 | [diff] [blame] | 1252 | static initcall_entry_t *initcall_levels[] __initdata = { |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 1253 | __initcall0_start, |
| 1254 | __initcall1_start, |
| 1255 | __initcall2_start, |
| 1256 | __initcall3_start, |
| 1257 | __initcall4_start, |
| 1258 | __initcall5_start, |
| 1259 | __initcall6_start, |
| 1260 | __initcall7_start, |
| 1261 | __initcall_end, |
| 1262 | }; |
| 1263 | |
Jim Cromie | 96263d2 | 2012-06-14 16:00:59 -0600 | [diff] [blame] | 1264 | /* Keep these in sync with initcalls in include/linux/init.h */ |
Alexey Dobriyan | 7c8f719 | 2019-01-03 15:27:29 -0800 | [diff] [blame] | 1265 | static const char *initcall_level_names[] __initdata = { |
Steven Rostedt (VMware) | a6fb601 | 2018-03-22 19:28:54 -0400 | [diff] [blame] | 1266 | "pure", |
Jim Cromie | 9fb48c7 | 2012-04-27 14:30:34 -0600 | [diff] [blame] | 1267 | "core", |
| 1268 | "postcore", |
| 1269 | "arch", |
| 1270 | "subsys", |
| 1271 | "fs", |
| 1272 | "device", |
| 1273 | "late", |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 1274 | }; |
| 1275 | |
Arvind Sankar | 7e2762e | 2020-01-30 22:17:16 -0800 | [diff] [blame] | 1276 | static int __init ignore_unknown_bootoption(char *param, char *val, |
| 1277 | const char *unused, void *arg) |
| 1278 | { |
| 1279 | return 0; |
| 1280 | } |
| 1281 | |
Masami Hiramatsu | 0068c92 | 2020-01-11 01:04:31 +0900 | [diff] [blame] | 1282 | static void __init do_initcall_level(int level, char *command_line) |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 1283 | { |
Ard Biesheuvel | 1b1eeca | 2018-08-21 21:56:13 -0700 | [diff] [blame] | 1284 | initcall_entry_t *fn; |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 1285 | |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 1286 | parse_args(initcall_level_names[level], |
Masami Hiramatsu | 0068c92 | 2020-01-11 01:04:31 +0900 | [diff] [blame] | 1287 | command_line, __start___param, |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 1288 | __stop___param - __start___param, |
| 1289 | level, level, |
Arvind Sankar | 7e2762e | 2020-01-30 22:17:16 -0800 | [diff] [blame] | 1290 | NULL, ignore_unknown_bootoption); |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 1291 | |
Steven Rostedt (VMware) | 4ee7c60 | 2018-03-23 10:18:03 -0400 | [diff] [blame] | 1292 | trace_initcall_level(initcall_level_names[level]); |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 1293 | for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) |
Ard Biesheuvel | 1b1eeca | 2018-08-21 21:56:13 -0700 | [diff] [blame] | 1294 | do_one_initcall(initcall_from_entry(fn)); |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 1295 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1296 | |
| 1297 | static void __init do_initcalls(void) |
| 1298 | { |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 1299 | int level; |
Alexey Dobriyan | 941baf6 | 2022-09-08 21:21:54 +0300 | [diff] [blame] | 1300 | size_t len = saved_command_line_len + 1; |
Masami Hiramatsu | 0068c92 | 2020-01-11 01:04:31 +0900 | [diff] [blame] | 1301 | char *command_line; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1302 | |
Masami Hiramatsu | 0068c92 | 2020-01-11 01:04:31 +0900 | [diff] [blame] | 1303 | command_line = kzalloc(len, GFP_KERNEL); |
| 1304 | if (!command_line) |
| 1305 | panic("%s: Failed to allocate %zu bytes\n", __func__, len); |
| 1306 | |
| 1307 | for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) { |
| 1308 | /* Parser modifies command_line, restore it each time */ |
| 1309 | strcpy(command_line, saved_command_line); |
| 1310 | do_initcall_level(level, command_line); |
| 1311 | } |
| 1312 | |
| 1313 | kfree(command_line); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1314 | } |
| 1315 | |
| 1316 | /* |
| 1317 | * Ok, the machine is now initialized. None of the devices |
| 1318 | * have been touched yet, but the CPU subsystem is up and |
| 1319 | * running, and memory and process management works. |
| 1320 | * |
| 1321 | * Now we can finally start doing some real work.. |
| 1322 | */ |
| 1323 | static void __init do_basic_setup(void) |
| 1324 | { |
Lai Jiangshan | 759ee09 | 2009-03-25 17:06:30 +0800 | [diff] [blame] | 1325 | cpuset_init_smp(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | driver_init(); |
Eric W. Biederman | b04c3af | 2007-02-14 00:33:57 -0800 | [diff] [blame] | 1327 | init_irq_proc(); |
Peter Oberparleiter | b99b87f7 | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 1328 | do_ctors(); |
wangyanqing | b0f8437 | 2011-09-29 15:09:40 +0800 | [diff] [blame] | 1329 | do_initcalls(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | } |
| 1331 | |
Eduard - Gabriel Munteanu | 7babe8d | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 1332 | static void __init do_pre_smp_initcalls(void) |
Eduard - Gabriel Munteanu | c2147a5 | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 1333 | { |
Ard Biesheuvel | 1b1eeca | 2018-08-21 21:56:13 -0700 | [diff] [blame] | 1334 | initcall_entry_t *fn; |
Eduard - Gabriel Munteanu | c2147a5 | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 1335 | |
Steven Rostedt (VMware) | 4ee7c60 | 2018-03-23 10:18:03 -0400 | [diff] [blame] | 1336 | trace_initcall_level("early"); |
Pawel Moll | 026cee0 | 2012-03-26 12:50:51 +1030 | [diff] [blame] | 1337 | for (fn = __initcall_start; fn < __initcall0_start; fn++) |
Ard Biesheuvel | 1b1eeca | 2018-08-21 21:56:13 -0700 | [diff] [blame] | 1338 | do_one_initcall(initcall_from_entry(fn)); |
Eduard - Gabriel Munteanu | c2147a5 | 2008-07-25 19:45:11 -0700 | [diff] [blame] | 1339 | } |
| 1340 | |
Al Viro | a74fb73 | 2012-10-10 21:28:25 -0400 | [diff] [blame] | 1341 | static int run_init_process(const char *init_filename) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | { |
Arvind Sankar | b88c50a | 2020-01-30 22:17:13 -0800 | [diff] [blame] | 1343 | const char *const *p; |
| 1344 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1345 | argv_init[0] = init_filename; |
Paul Menzel | 3f5c15d | 2018-08-21 21:58:37 -0700 | [diff] [blame] | 1346 | pr_info("Run %s as init process\n", init_filename); |
Arvind Sankar | b88c50a | 2020-01-30 22:17:13 -0800 | [diff] [blame] | 1347 | pr_debug(" with arguments:\n"); |
| 1348 | for (p = argv_init; *p; p++) |
| 1349 | pr_debug(" %s\n", *p); |
| 1350 | pr_debug(" with environment:\n"); |
| 1351 | for (p = envp_init; *p; p++) |
| 1352 | pr_debug(" %s\n", *p); |
Eric W. Biederman | be619f7 | 2020-07-13 12:06:48 -0500 | [diff] [blame] | 1353 | return kernel_execve(init_filename, argv_init, envp_init); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | } |
| 1355 | |
Michael Opdenacker | ba24762 | 2013-11-12 15:10:21 -0800 | [diff] [blame] | 1356 | static int try_to_run_init_process(const char *init_filename) |
| 1357 | { |
| 1358 | int ret; |
| 1359 | |
| 1360 | ret = run_init_process(init_filename); |
| 1361 | |
| 1362 | if (ret && ret != -ENOENT) { |
| 1363 | pr_err("Starting init: %s exists but couldn't execute it (error %d)\n", |
| 1364 | init_filename, ret); |
| 1365 | } |
| 1366 | |
| 1367 | return ret; |
| 1368 | } |
| 1369 | |
Vineet Gupta | f80b0c9 | 2012-12-21 12:25:44 +0530 | [diff] [blame] | 1370 | static noinline void __init kernel_init_freeable(void); |
Al Viro | d6b2123 | 2012-10-10 19:57:26 -0400 | [diff] [blame] | 1371 | |
Laura Abbott | 0f5bf6d | 2017-02-06 16:31:58 -0800 | [diff] [blame] | 1372 | #if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX) |
AKASHI Takahiro | 39290b3 | 2016-11-14 15:15:05 +0900 | [diff] [blame] | 1373 | bool rodata_enabled __ro_after_init = true; |
Mark Rutland | 2e8cff0 | 2022-08-17 16:40:22 +0100 | [diff] [blame] | 1374 | |
| 1375 | #ifndef arch_parse_debug_rodata |
| 1376 | static inline bool arch_parse_debug_rodata(char *str) { return false; } |
| 1377 | #endif |
| 1378 | |
Kees Cook | d2aa1ac | 2016-02-17 14:41:13 -0800 | [diff] [blame] | 1379 | static int __init set_debug_rodata(char *str) |
| 1380 | { |
Mark Rutland | 2e8cff0 | 2022-08-17 16:40:22 +0100 | [diff] [blame] | 1381 | if (arch_parse_debug_rodata(str)) |
| 1382 | return 0; |
| 1383 | |
| 1384 | if (str && !strcmp(str, "on")) |
| 1385 | rodata_enabled = true; |
| 1386 | else if (str && !strcmp(str, "off")) |
| 1387 | rodata_enabled = false; |
| 1388 | else |
Randy Dunlap | f9a40b0 | 2022-03-23 16:06:14 -0700 | [diff] [blame] | 1389 | pr_warn("Invalid option string for rodata: '%s'\n", str); |
Mark Rutland | 2e8cff0 | 2022-08-17 16:40:22 +0100 | [diff] [blame] | 1390 | return 0; |
Kees Cook | d2aa1ac | 2016-02-17 14:41:13 -0800 | [diff] [blame] | 1391 | } |
Mark Rutland | 2e8cff0 | 2022-08-17 16:40:22 +0100 | [diff] [blame] | 1392 | early_param("rodata", set_debug_rodata); |
AKASHI Takahiro | 39290b3 | 2016-11-14 15:15:05 +0900 | [diff] [blame] | 1393 | #endif |
Kees Cook | d2aa1ac | 2016-02-17 14:41:13 -0800 | [diff] [blame] | 1394 | |
Laura Abbott | 0f5bf6d | 2017-02-06 16:31:58 -0800 | [diff] [blame] | 1395 | #ifdef CONFIG_STRICT_KERNEL_RWX |
Kees Cook | d2aa1ac | 2016-02-17 14:41:13 -0800 | [diff] [blame] | 1396 | static void mark_readonly(void) |
| 1397 | { |
Jinbum Park | 2959a5f | 2017-02-27 14:30:22 -0800 | [diff] [blame] | 1398 | if (rodata_enabled) { |
Jeffrey Hugo | ae646f0 | 2018-05-11 16:01:42 -0700 | [diff] [blame] | 1399 | /* |
Paul E. McKenney | ba18031 | 2018-11-06 18:58:01 -0800 | [diff] [blame] | 1400 | * load_module() results in W+X mappings, which are cleaned |
| 1401 | * up with call_rcu(). Let's make sure that queued work is |
Jeffrey Hugo | ae646f0 | 2018-05-11 16:01:42 -0700 | [diff] [blame] | 1402 | * flushed so that we don't hit false positives looking for |
| 1403 | * insecure pages which are W+X. |
| 1404 | */ |
Paul E. McKenney | ba18031 | 2018-11-06 18:58:01 -0800 | [diff] [blame] | 1405 | rcu_barrier(); |
Kees Cook | d2aa1ac | 2016-02-17 14:41:13 -0800 | [diff] [blame] | 1406 | mark_rodata_ro(); |
Jinbum Park | 2959a5f | 2017-02-27 14:30:22 -0800 | [diff] [blame] | 1407 | rodata_test(); |
| 1408 | } else |
Kees Cook | d2aa1ac | 2016-02-17 14:41:13 -0800 | [diff] [blame] | 1409 | pr_info("Kernel memory protection disabled.\n"); |
| 1410 | } |
Christophe Leroy | f596ded1 | 2020-01-30 22:17:23 -0800 | [diff] [blame] | 1411 | #elif defined(CONFIG_ARCH_HAS_STRICT_KERNEL_RWX) |
| 1412 | static inline void mark_readonly(void) |
| 1413 | { |
| 1414 | pr_warn("Kernel memory protection not selected by kernel config.\n"); |
| 1415 | } |
Kees Cook | d2aa1ac | 2016-02-17 14:41:13 -0800 | [diff] [blame] | 1416 | #else |
| 1417 | static inline void mark_readonly(void) |
| 1418 | { |
| 1419 | pr_warn("This architecture does not have kernel memory protection.\n"); |
| 1420 | } |
| 1421 | #endif |
| 1422 | |
Mike Rapoport | 997aef6 | 2019-05-13 17:18:40 -0700 | [diff] [blame] | 1423 | void __weak free_initmem(void) |
| 1424 | { |
Mike Rapoport | f403999 | 2019-05-13 17:18:46 -0700 | [diff] [blame] | 1425 | free_initmem_default(POISON_FREE_INITMEM); |
Mike Rapoport | 997aef6 | 2019-05-13 17:18:40 -0700 | [diff] [blame] | 1426 | } |
| 1427 | |
Al Viro | d6b2123 | 2012-10-10 19:57:26 -0400 | [diff] [blame] | 1428 | static int __ref kernel_init(void *unused) |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 1429 | { |
Michael Opdenacker | ba24762 | 2013-11-12 15:10:21 -0800 | [diff] [blame] | 1430 | int ret; |
| 1431 | |
Peter Zijlstra | 15faafc | 2021-05-31 12:21:13 +0200 | [diff] [blame] | 1432 | /* |
| 1433 | * Wait until kthreadd is all set-up. |
| 1434 | */ |
| 1435 | wait_for_completion(&kthreadd_done); |
| 1436 | |
Al Viro | d6b2123 | 2012-10-10 19:57:26 -0400 | [diff] [blame] | 1437 | kernel_init_freeable(); |
Arjan van de Ven | 22a9d64 | 2009-01-07 08:45:46 -0800 | [diff] [blame] | 1438 | /* need to finish all async __init code before freeing the memory */ |
| 1439 | async_synchronize_full(); |
Christophe Leroy | d2635f2 | 2021-11-05 13:40:40 -0700 | [diff] [blame] | 1440 | |
| 1441 | system_state = SYSTEM_FREEING_INITMEM; |
Masami Hiramatsu | 82d083a | 2020-09-10 17:55:05 +0900 | [diff] [blame] | 1442 | kprobe_free_init_mem(); |
Steven Rostedt (VMware) | b80f0f6 | 2017-04-03 12:57:35 -0400 | [diff] [blame] | 1443 | ftrace_free_init_mem(); |
Sumit Garg | d54ce61 | 2021-02-25 17:22:38 -0800 | [diff] [blame] | 1444 | kgdb_free_init_mem(); |
Masami Hiramatsu | 40caa12 | 2021-09-05 00:54:09 +0900 | [diff] [blame] | 1445 | exit_boot_config(); |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 1446 | free_initmem(); |
Kees Cook | d2aa1ac | 2016-02-17 14:41:13 -0800 | [diff] [blame] | 1447 | mark_readonly(); |
Joerg Roedel | b976690 | 2018-07-18 11:41:06 +0200 | [diff] [blame] | 1448 | |
| 1449 | /* |
| 1450 | * Kernel mappings are now finalized - update the userspace page-table |
| 1451 | * to finalize PTI. |
| 1452 | */ |
| 1453 | pti_finalize(); |
| 1454 | |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 1455 | system_state = SYSTEM_RUNNING; |
| 1456 | numa_default_policy(); |
| 1457 | |
Paul E. McKenney | 967dcb8 | 2015-11-25 16:52:36 -0800 | [diff] [blame] | 1458 | rcu_end_inkernel_boot(); |
| 1459 | |
Vlastimil Babka | 3db978d | 2020-06-07 21:40:24 -0700 | [diff] [blame] | 1460 | do_sysctl_args(); |
| 1461 | |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 1462 | if (ramdisk_execute_command) { |
Michael Opdenacker | ba24762 | 2013-11-12 15:10:21 -0800 | [diff] [blame] | 1463 | ret = run_init_process(ramdisk_execute_command); |
| 1464 | if (!ret) |
Al Viro | a74fb73 | 2012-10-10 21:28:25 -0400 | [diff] [blame] | 1465 | return 0; |
Michael Opdenacker | ba24762 | 2013-11-12 15:10:21 -0800 | [diff] [blame] | 1466 | pr_err("Failed to execute %s (error %d)\n", |
| 1467 | ramdisk_execute_command, ret); |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 1468 | } |
| 1469 | |
| 1470 | /* |
| 1471 | * We try each of these until one succeeds. |
| 1472 | * |
| 1473 | * The Bourne shell can be used instead of init if we are |
| 1474 | * trying to recover a really broken machine. |
| 1475 | */ |
| 1476 | if (execute_command) { |
Michael Opdenacker | ba24762 | 2013-11-12 15:10:21 -0800 | [diff] [blame] | 1477 | ret = run_init_process(execute_command); |
| 1478 | if (!ret) |
Al Viro | a74fb73 | 2012-10-10 21:28:25 -0400 | [diff] [blame] | 1479 | return 0; |
Andy Lutomirski | 6ef4536 | 2014-12-10 15:52:19 -0800 | [diff] [blame] | 1480 | panic("Requested init %s failed (error %d).", |
| 1481 | execute_command, ret); |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 1482 | } |
Chris Down | ada4ab7 | 2020-06-04 16:50:53 -0700 | [diff] [blame] | 1483 | |
| 1484 | if (CONFIG_DEFAULT_INIT[0] != '\0') { |
| 1485 | ret = run_init_process(CONFIG_DEFAULT_INIT); |
| 1486 | if (ret) |
| 1487 | pr_err("Default init %s failed (error %d)\n", |
| 1488 | CONFIG_DEFAULT_INIT, ret); |
| 1489 | else |
| 1490 | return 0; |
| 1491 | } |
| 1492 | |
Michael Opdenacker | ba24762 | 2013-11-12 15:10:21 -0800 | [diff] [blame] | 1493 | if (!try_to_run_init_process("/sbin/init") || |
| 1494 | !try_to_run_init_process("/etc/init") || |
| 1495 | !try_to_run_init_process("/bin/init") || |
| 1496 | !try_to_run_init_process("/bin/sh")) |
Al Viro | a74fb73 | 2012-10-10 21:28:25 -0400 | [diff] [blame] | 1497 | return 0; |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 1498 | |
Michael Opdenacker | ba24762 | 2013-11-12 15:10:21 -0800 | [diff] [blame] | 1499 | panic("No working init found. Try passing init= option to kernel. " |
Mauro Carvalho Chehab | 8c27ceff3 | 2016-10-18 10:12:27 -0200 | [diff] [blame] | 1500 | "See Linux Documentation/admin-guide/init.rst for guidance."); |
Vivek Goyal | ee5bfa6 | 2007-02-13 13:26:22 +0100 | [diff] [blame] | 1501 | } |
| 1502 | |
Christoph Hellwig | 8f74063 | 2020-06-07 17:44:28 +0200 | [diff] [blame] | 1503 | /* Open /dev/console, for stdin/stdout/stderr, this should never fail */ |
Christoph Hellwig | a94b521 | 2020-07-28 18:23:21 +0200 | [diff] [blame] | 1504 | void __init console_on_rootfs(void) |
Dominik Brodowski | b49a733 | 2018-10-23 16:00:10 +0200 | [diff] [blame] | 1505 | { |
Christoph Hellwig | 8f74063 | 2020-06-07 17:44:28 +0200 | [diff] [blame] | 1506 | struct file *file = filp_open("/dev/console", O_RDWR, 0); |
Dominik Brodowski | b49a733 | 2018-10-23 16:00:10 +0200 | [diff] [blame] | 1507 | |
Christoph Hellwig | 8f74063 | 2020-06-07 17:44:28 +0200 | [diff] [blame] | 1508 | if (IS_ERR(file)) { |
Petr Mladek | a91bd62 | 2021-01-08 12:48:47 +0100 | [diff] [blame] | 1509 | pr_err("Warning: unable to open an initial console.\n"); |
| 1510 | return; |
Christoph Hellwig | 8f74063 | 2020-06-07 17:44:28 +0200 | [diff] [blame] | 1511 | } |
Christoph Hellwig | f073531 | 2020-07-28 17:49:47 +0200 | [diff] [blame] | 1512 | init_dup(file); |
| 1513 | init_dup(file); |
| 1514 | init_dup(file); |
| 1515 | fput(file); |
Dominik Brodowski | b49a733 | 2018-10-23 16:00:10 +0200 | [diff] [blame] | 1516 | } |
| 1517 | |
Vineet Gupta | f80b0c9 | 2012-12-21 12:25:44 +0530 | [diff] [blame] | 1518 | static noinline void __init kernel_init_freeable(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1519 | { |
Linus Torvalds | 31a6710 | 2012-05-21 12:52:42 -0700 | [diff] [blame] | 1520 | /* Now the scheduler is fully set up and can do blocking allocations */ |
| 1521 | gfp_allowed_mask = __GFP_BITS_MASK; |
| 1522 | |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 1523 | /* |
| 1524 | * init can allocate pages on any node |
| 1525 | */ |
Lai Jiangshan | 3c466d4 | 2012-12-12 13:51:40 -0800 | [diff] [blame] | 1526 | set_mems_allowed(node_states[N_MEMORY]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1527 | |
Mark Rutland | 0711f0d | 2021-06-04 20:01:14 -0700 | [diff] [blame] | 1528 | cad_pid = get_pid(task_pid(current)); |
Cedric Le Goater | 9ec5209 | 2006-10-02 02:19:00 -0700 | [diff] [blame] | 1529 | |
Andi Kleen | ca74a6f | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 1530 | smp_prepare_cpus(setup_max_cpus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1531 | |
Tejun Heo | 3347fa0 | 2016-09-16 15:49:32 -0400 | [diff] [blame] | 1532 | workqueue_init(); |
| 1533 | |
Michal Hocko | 597b730 | 2017-03-31 15:11:47 -0700 | [diff] [blame] | 1534 | init_mm_internals(); |
| 1535 | |
Uladzislau Rezki (Sony) | 1b04fa9 | 2020-12-09 21:27:31 +0100 | [diff] [blame] | 1536 | rcu_init_tasks_generic(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | do_pre_smp_initcalls(); |
Peter Zijlstra | 004417a | 2010-11-25 18:38:29 +0100 | [diff] [blame] | 1538 | lockup_detector_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1539 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1540 | smp_init(); |
| 1541 | sched_init_smp(); |
| 1542 | |
Tejun Heo | 2930155 | 2023-08-07 15:57:24 -1000 | [diff] [blame] | 1543 | workqueue_init_topology(); |
Daniel Jordan | f1b192b | 2020-06-03 15:59:35 -0700 | [diff] [blame] | 1544 | padata_init(); |
Mel Gorman | 0e1cc95 | 2015-06-30 14:57:27 -0700 | [diff] [blame] | 1545 | page_alloc_init_late(); |
| 1546 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1547 | do_basic_setup(); |
| 1548 | |
Brendan Higgins | 8c0d884 | 2020-08-04 13:47:43 -0700 | [diff] [blame] | 1549 | kunit_run_all_tests(); |
| 1550 | |
Rasmus Villemoes | e7cb072 | 2021-05-06 18:05:42 -0700 | [diff] [blame] | 1551 | wait_for_initramfs(); |
Dominik Brodowski | b49a733 | 2018-10-23 16:00:10 +0200 | [diff] [blame] | 1552 | console_on_rootfs(); |
Eric W. Biederman | 2bd3a997 | 2010-03-02 23:53:19 -0800 | [diff] [blame] | 1553 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1554 | /* |
| 1555 | * check if there is an early userspace init. If yes, let it do all |
| 1556 | * the work |
| 1557 | */ |
Christoph Hellwig | eb9d7d3 | 2020-07-22 11:14:02 +0200 | [diff] [blame] | 1558 | if (init_eaccess(ramdisk_execute_command) != 0) { |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 1559 | ramdisk_execute_command = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1560 | prepare_namespace(); |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 1561 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1562 | |
| 1563 | /* |
| 1564 | * Ok, we have completed the initial bootup, and |
| 1565 | * we're essentially up and running. Get rid of the |
| 1566 | * initmem segments and start the user-mode stuff.. |
Dmitry Kasatkin | c9cd2ce | 2014-11-05 17:01:15 +0200 | [diff] [blame] | 1567 | * |
| 1568 | * rootfs is available now, try loading the public keys |
| 1569 | * and default modules |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1570 | */ |
Tejun Heo | bb813f4 | 2013-01-18 14:05:56 -0800 | [diff] [blame] | 1571 | |
Dmitry Kasatkin | c9cd2ce | 2014-11-05 17:01:15 +0200 | [diff] [blame] | 1572 | integrity_load_keys(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | } |